chapter 11 ii graphs of functions enhancement
TRANSCRIPT
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
1/31
CHAPTER 11 : GRAPHS OF FUNCTIONS II
Steps involved in solving an equation graphically:
1. Find they value by substitutingx valueinto the given function.
2. Draw the graph by using the given scale for x-axis and y- axis.
3. Find the value of y or x when given value of x or y from the graph.
4. On the same axes, draw a suitable straight line which satisfies the equation.
5. Determine the solutions by reading off the x-coordinates of the point of
intersection of the two graphs.
Graphs of Functions 1
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
2/31
11.1 : Linear Function
Complete the following table below
Graphs of Functions 2
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
3/31
Graphs of Functions 3
Example 1:
Complete the following table for theequation xy =
x 0 2 3y 0 2 3
By using scientific calculator, substitute
each of the x value in equation above.
x xy =
0 0
2 2
3 3
Exercise 1
Complete the following table for theequation
i. xy = x 0 2 3y
By using scientific calculator, substitute
each of the x value in equation above.
x xy =
0
2
3
ii. xy =
x 0 2 3y
By using scientific calculator, substituteeach of the x value in equation above.
x xy =
0
2
3
Example 2
Complete the following table for theequation 32 += xy
x -1 0 3y 1 3 9
By using scientific calculator, substitute
each of the x value in equation above.
x 3)(2 += xy
-1 2(-1) + 3 = 1
0 2(0) + 3 = 33 2(3) + 3 = 9
Exercise 2
Complete the following table for theequation 13 += xy
x -1 0 3y
By using scientific calculator, substitute
each of the x value in equation above.
x 1)(3 += xy
-1
03
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
4/31
11.2 : Quadratic Function
Complete the following table below
Graphs of Functions 4
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
5/31
Example:
1. Complete the following table for
the equation y = 2x 2
x 1 2 3
y 2 8 18
By using scientific calculator, substitute
each of the x value in equation above.
x y
1 2(1) 2 = 2
2 2(2) 2 = 8
3 2(3) 2 = 18
Exercise:
Complete the following table for theequations:
1. y = - 2x 2
x -1 0 1y
By using scientific calculator, substitute each
of the x value in equation above.
x y=- 2(x) 2
-1
0
1
2. y =21 x 2
x -1 0 1
y
By using scientific calculator, substitute eachof the x value in equation above.
xy =
2
1(x) 2
-1
0
1
3. y = 3x 2
x -1 0 1
y
By using scientific calculator, substitute each
of the x value in equation above.
x y = 3(x)
2
-1
0
1
4. y = -2
5x 2
Graphs of Functions 5
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
6/31
x -1 0 1
y
By using scientific calculator, substitute each
of the x value in equation above.
xy = -
2
5(x) 2
-1
0
1
5. y = 5x 2
x -1 0 1
y
By using scientific calculator, substitute each
of the x value in equation above.
x y = 5(x) 2
-1
0
1
11.3 : Cubic Function
Complete the following table below
Graphs of Functions 6
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
7/31
Example 1
Complete the following table for the
equation 33xy =
x 1 2 3y 3 24 81
By using scientific calculator, substitute
each of the x value in equation above.
x 3)(3 xy =
1 3)1(3 3 =
2 24)2(3 3 =
3 81)3(3 3 =
Exercise 1
Complete the following table for the
equations:
i. 35xy =
x 1 2 3y
By using scientific calculator, substitute
each of the x value in equation above.
x 3)(5 xy =
1
2
3
ii. 32xy =
x 1 2 3y
By using scientific calculator, substitute
each of the x value in equation above.
x 3)(2 xy =
1
2
3
Graphs of Functions 7
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
8/31
Example 2
Complete the following table for the
equation 52 3 += xy
x -2 0 2y -11 5 21
By using scientific calculator, substitute
each of the x value in equation above.x 5)(2 3 += xy
-2 115)2(2 3 =+
0 55)0(2 3 =+
2 215)2(2 3 =+
Example 3
Complete the following table for the
equation 43 += xy
x -1 -2 3y 5 12 -23
By using scientific calculator, substituteeach of the x value in equation above.
x 4)( 3 += xy
-1 54)1( 3 =+
-2 124)2( 3 =+
3 234)3( 3 =+
Exercise 2
Complete the following table for the
equation 53 += xy x -2 0 2
y
By using scientific calculator, substitute
each of the x value in equation above.x 5)(
3+= xy
-2
0
2
Exercise 3
Complete the following table for the
equation
i. 33 += xy x -1 -2 3y
By using scientific calculator, substitute
each of the x value in equation above.x 3)( 3 += xy
-1
-2
3
ii. 12 3 = xy x -1 -2 3y
By using scientific calculator, substitute
each of the x value in equation above.x 1)(2 3 = xy
-1-2
3
Example 4
Complete the following table for the
Exercise 4
Complete the following table for the
Graphs of Functions 8
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
9/31
equation 943 = xxy
x -3 0 2y -24 -9 -9
By using scientific calculator, substituteeach of the x value in equation above.
x 9)(4)( 3 = xxy
-3 249)3(4)3( 3 =
0 99)0(4)0( 3 =
2 99)2(4)2( 3 =
equations:
i. 733 += xxy
x -3 0 2y
By using scientific calculator, substituteeach of the x value in equation above.
x 7)(3)(3
+= xxy
-3
0
2
ii. 3612 xxy =
x 1 0 2y
By using scientific calculator, substitute
each of the x value in equation above.
x 3)()(612 xxy =
1
0
2
11.4 : Reciprocal Function
Complete the following table below
Graphs of Functions 9
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
10/31
Example 1:
Complete the following table for the
equation y =x
1
x -2 -1 1 2
y -1/2 -1 1 1/2
By using scientific calculator, substitute each
of the x value in equation above.
x y
-2 -
-1 - 1/1 = -1
1 1/1 = 1
2
Exercise:
Complete the following table for the
equations:
1. y = -x
2
x -2 -1 1 2
y
By using scientific calculator, substitute
each of the x value in equation above.
xy = -
x
2
-2
-1
1
2
2. y =x
3
x -2 -1 1 2
y
By using scientific calculator, substituteeach of the x value in equation above.
xy =
x
3
-2
-1
1
2
3. y = -x2
1
x -2 -1 1 2
Graphs of Functions 10
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
11/31
y
By using scientific calculator, substituteeach of the x value in equation above.
x y = -x21
-2
-1
1
2
4. y =x
16
x -2 -1 1 2
y
By using scientific calculator, substitute
each of the x value in equation above.
xy =
x
16
-2
-1
1
2
5. y = -x
5
x -2 -1 1 2
y
By using scientific calculator, substitute
Graphs of Functions 11
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
12/31
each of the x value in equation above.
xy = -
x
5
-2
-11
2
11.21 : Quadratic Graph
Example :
a) Complete the following table for the equation 542 2 = xxy
Graphs of Functions 12
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
13/31
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 5 unit on the y-axis, draw the
graph of 542 2 = xxy for 52 x
c) From your graph, find
i) the value of y, when x = -1.5
ii) the values of x, when y= 0
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation 03822
=+ xx for 52 x . State the values of x.
Answer For Example :
a) x = -1, y = 1
x = 2, y = -5
x = 4, y = 11
b) Refer graph on the next page
c) i) y = 5.5
ii) x = -0.9, 2.9
d)
Therefore, the appropriate graph that should be drawn is
x 0 1
y 8 4
From the graph, the solutions of the equation are
x = 0.4, 3.65
Another Method
We can also use the discrimination method to find the appropriate graph
to be drawn.
Graphs of Functions 13
x -2 -1 0 1 2 3 4 5
y 11 -5 -7 1 25
0382 2 =+ xx
382 2 = xx
54385422
= xxxx
84 = xy
Rearrange the equation
so that one side of theequation is 2x2 4x5
84 = xy
03822
=+ xx
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
14/31
)1.(..........542 2 = xxy
)2.(..........38202
+= xx
84:)2()1( = xy
Graphs of Functions 14
Graph for Example Quadratic Graph
-2 -1 0 1 2 3 4 5
-5
--10
5
10
15
20
25
y
x
x
x
x
x
x
x
x
x
x
x
y = 4x - 8
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
15/31
Exercise 1 :
a) Complete the following table for the equation 592 2 += xxy
Graphs of Functions 15
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
16/31
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 5 unit on the y-axis, draw the
graph of 5922
+= xxy for 70 x
c) From your graph, findi) the value of y, when x = 1.7
ii) the value of x, when y = 15
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation 041022
=+ xx for 70 x . State the values of x.
Exercise 2 :
a) Complete the following table for the equation 752 2 = xxy
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 5 unit on the y-axis, draw the
graph of 752 2 = xxy for 53 x
c) From your graph, find
i) the value of y, when x = -2.5
ii) the value of x, when y = 15
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation 04722
=+ xx for 53 x . State the values of x.
Exercise 3:
a) Complete the following table for the equation ( ) 952 = xxy
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 5 unit on the y-axis, draw the
graph of ( ) 952 = xxy for 53 xc) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation ( ) xxx 24952 = for 53 x . State the values of x.
Exercise 4 :
a) Complete the following table for the equation 523 2 ++= xxy
Graphs of Functions 16
x 0 1 2 3 4 5 6 7
y 5 -2 -5 1 10 40
x -3 -2 -1 0 1 2 3 4 5y 26 0 -7 -10 -9 5 18
x -3 -2 -1 0 1 2 3 4 5
y 24 -2 -9 -12 -11 3 6
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
17/31
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 5 unit on the y-axis, draw thegraph of 523
2++= xxy for 43 x
c) From your graph, find
i) the value of y, when x = -0.5
ii) the value of x, that satisfy the equation of 5232
= xx
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation 025232
=+ xx for 43 x . State the values of x.
Exercise 5 :
a) Complete the following table for the equation ( )xxy = 8
2
1
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 1 unit on the y-axis, draw the
graph of ( )xxy = 82
1for 70 x
c) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation ( ) 108 =xx for 70 x . State the values of x.
Exercise 6 :
a) Complete the following table for the equation2238 xxy +=
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 5 unit on the y-axis, draw the
graph of2238 xxy += for 43 x
c) From your graph, find
i) the value of y, when x = 1.35
ii) the values of x, when y = -10
d) Draw a suitable straight line on your graph to find the values of x which satisfy theequation 026322
=+ xx for 43 x . State the values of x.
Exercise 7 :
Graphs of Functions 17
x -3 -2 -1 0 1 2 3 4
y 11 0 4 -16 -35
x 0 0.5 1 2 3 4 5 6 7
y 0 1.88 6 7.5 7.5 3.5
x -3 -2 -1 0 1 2 3 4
y -19 3 8 9 6 -12
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
18/31
a) Complete the following table for the equation2275 xxy +=
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 5 unit on the y-axis, draw the
graph of2275 xxy += for 53 x
c) From your graph, find
i) the value of y, when x = 3.2
ii) the values of x, when y = -20
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation 011322
= xx for 53 x . State the values of x.
Exercise 8 :
a) Complete the following table for the equation 2273 xxy +=
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 5 unit on the y-axis, draw the
graph of2273 xxy += for 53 x
c) From your graph, find
i) the value of y, when x = 1.3
ii) the values of x, when y = -25
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation 013322
= xx for 53 x . State the values of x.
Graphs of Functions 18
x -3 -2 -1 0 1 2 3 4 5
y -34 -4 5 11 8 -10
x -3 -2 -1 0 1 2 3 4 5
y -36 -6 3 9 6 -12
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
19/31
11.31 : Cubic Graph
Example 1:
a) Complete the following table for the equation 583 += xxy
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 5 unit on the y-axis, draw the
graph of 583
+= xxy for 43 x
c) From your graph, find
i) the value of y, when x = -1.4
ii) the value of x, when y= 25
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation 01123
= xx for 43 x . State the values of x.
Answer For Example :
a) x = -2, y = 13
x = 1, y = -2
x = 3, y = 8
b) Refer graph on the next page
c) i) y = 13. 5
ii) x = 3.7
d)
Therefore, the appropriate graph that should be drawn is
x 0 1
y 6 10
From the graph, the solutions of the equation are
x = 0.1, 3.5
Graphs of Functions 19
x -3 -2 -1 0 1 2 3 3.5 4
y 2 12 5 -3 19.9 37
01123 = xx
1123
+= xx
58112583
++=+ xxxx
64 += xy
Rearrange the equation
so that one side of theequation isx3 8x + 5
64 += xy
01123
= xx
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
20/31
Graphs of Functions 20
Graph for Example Cubic Graph
-3 -2 -1 0 1 2 3 4x
-5
5
10
15
20
25
30
35
40
y
x
x
x
x
x
x
x
x
x
x
x
=y 64 +x
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
21/31
Exercise 1:
a) Complete the following table for the equation 5103 += xxy
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 5 unit on the y-axis, draw the
graph of 5103 += xxy for 5.35.3 x
c) From your graph, find the value of y, when x = -2.5
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation 6103
= xx for 5.35.3 x . State the values of x.
Exercise 2:
a) Complete the following table for the equation 18103 += xxy
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 5 unit on the y-axis, draw the
graph of 18103
+= xxy for 43 x
c) From your graph, find the value of y, when x = -0.5
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation 010103
= xx for 4.3 x . State the values of x.
Exercise 3:
a) Complete the following table for the equation 7123
+= xxy
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 5 unit on the y-axis, draw the
graph of 7123 += xxy for 44 x
c) From your graph, find
i) the value of y, when x = 2.5
ii) the values of negative x that satisfy the equation 7123
= xx
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation 02153
=+ xx for 44 x . State the values of x.
Graphs of Functions 21
x -3.5 -3 -2 -1 0 1 2 3 3.5
y -2.9 8 14 5 -7 12.9
x -3 -2 -1 0 1 2 3 3.5 4
y 21 27 18 6 25.88 42
x -4 -3 -2 -1 0 1 2 3 4
y -9 16 18 7 -4 -9 23
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
22/31
Exercise 4:
a) Complete the following table for the equation 6123 += xxy
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 10 unit on the y-axis, draw
the graph of 6123 += xxy for 45 x
c) From your graph, find
i) the value of y, when x = -2.5ii) the values of positive x, when y = 0
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation 12123
= xx for 44 x . State the values of x.
Exercise 5:
a) Complete the following table for the equation 1253 = xxy
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 5 unit on the y-axis, draw the
graph of 1253 = xxy for 5.33 x
c) From your graph, find
i) the value of y, when x = 0.8
ii) the value of x which satisfies the equation 1253
= xx
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation 493
= xx for 5.33 x . State the values of x.
Graphs of Functions 22
x -5 -4 -3 -2 -1 0 1 2 3 4
y -59 -10 22 17 6 -5 -3 22
x -3 -2 -1.5 -1 0 1 2 3 3.5
y -10 -7.9 -8 -12 -16 0 13.4
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
23/31
11.41 : Reciprocal Graph
Example 1:
a) Complete the following table for the equationx
y8
=
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 2 unit on the y-axis, draw the
graph ofx
y8
= for 55 x
c) From your graph, find
i) the value of y, when x = -3.2
ii) the value of x, when y = 4.4d) From the graph, state the values of x when x and y have a same value.
Answer For Example :
a) x = -5, y = -1.6
x = -2.5, y = -3.2x = 1.6, y = 5
b) Refer graph on the next page
c) i) y = -2.6
ii) x = 1.8
d) x = -2.7, 2.73
Graphs of Functions 23
x -5 -4 -2.5 -1.6 -1 1 1.6 2.5 4 5
y -2 -5 -8 8 3.2 2 1.6
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
24/31
Graphs of Functions 24
x
Graph for Example Reciprocal Graph
-2
-4
-6
-8
0
2
4
6
8
10
y
-1-2-3-4 1 2 3 4
x
x
x
x
x
x
x
x
x
x
y = x
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
25/31
Exercise 1:
a) Complete the following table for the equationx
y1
=
b) By using a scale of 2 cm to 1 unit on the x-axis and 4cm to 1 unit on the y-axis, draw the
graph ofx
y1
= for 44 x
c) From your graph, find the value of y, when x = -2.4
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation ( )0,11 = xxx
for 44 x . State the values of x.
Exercise 2:
a) Complete the following table for the equationx
y6
=
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 2 unit on the y-axis, draw thegraph of
xy
6= for 44 x
c) From your graph,
i) find the value of y, when x = 1.3
ii) find the value of x, when y = 3.5
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation xx
=+13
for 44 x . State the values of x.
Exercise 3:
a) Complete the following table for the equationx
y2
=
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 1 unit on the y-axis, draw the
graph ofx
y2
= for 44 x
Graphs of Functions 25
x -4 -3 -2 -1 -0.5 0.5 1 2 3 4
y -0.25 -0.33 -1 -2 1 0.5 0.25
x -4 -2.5 -1 -0.6 0.6 1 2 3 4
y 1.5 6 10 -10 -6 -3 -1.5
x -4 -3 -2 -1 -0.5 0.5 1 2 3 4
y -0.5 -0.7 -1 -2 4 1 0.7 0.5
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
26/31
c) From your graph,
i) find the value of y, when x = 1.5
ii) find the value of x, when y = -1.8
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equationx
x4
12 =+ for 44 x . State the values of x.
Exercise 4:
a) Complete the following table for the equationx
y4
=
b) By using a scale of 2 cm to 1 unit on the x-axis and 2cm to 2unit on the y-axis, draw the
graph of xy
4= for 55 x
c) From your graph,
i) find the value of y, when x = -1.4
ii) find the value of x, when y = 4.4
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation 02
3= x
xfor 45.0 x . State the values of x.
Exercise 5:
a) Complete the following table for the equation 12
3+=
xy
b) By using a scale of 2 cm to 0.5 unit on the x-axis and 2cm to 0.5unit on the y-axis, draw
the graph of 12
3+=
xy for 45.0 x
c) From your graph,
i) find the value of y, when x = 1.3
ii) find the value of x, when y = 2.8
d) Draw a suitable straight line on your graph to find the values of x which satisfy the
equation 02
3= x
xfor 45.0 x . State the values of x.
Graphs of Functions 26
x -5 -4 -2 -1 -0.5 0.5 0.8 1.5 2.5 5
y -1 -4 -8 8 5 1.6
x 0.5 1 1.5 2 2.5 3 3.5 4
y 4 2.5 1.75 1.6 1.43 1.38
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
27/31
PAST YEAR EXAMINATION QUESTIONS
1. Nov 2003, Q12
(a) Complete the following table for the equationx
y4
= .
(b)
x -4 -2.5 -1 -0.5 0.5 1 2 3.2 4
y 1 1.6 8 -8 -4 -1.25 -1
[2 marks]
(c) For this part of the question, use the graph paper. You may use a flexible curve.
By using a scale of 2 cm to 1 unit on thex-axis and 2 cm to 2 units on they-axis,
draw the graph ofx
y4
= for -4 x 4.
[5 marks](d) From your graph, find
(i) the value ofy whenx = 1.8,
(ii) the value ofx wheny = 3.4.[2 marks]
(e) Draw a suitable straight line on your graph to find all the values ofx which
satisfy the equation 324 += xx
for -4 x 4.
State these values ofx.[3 marks]
2. July 2004, Q12
(a) Table 2 shows values ofx andy which satisfy the equation 1053 += xxy .
x -3.4 -3 -2 -1 0 1 2 3 3.4
y 12.3 k 12 14 10 6 m 22 32.3
TABLE 2
Calculate the value ofkand ofm. [2 marks]
(b) For this part of the question, use the graph paper on page 33.You may use a flexible curve rule.By using a scale of 2 cm to 1 unit on thex-axis and 2 cm to 5 units on they-axis,
draw the graph of 1053
+= xxy for -3.4 x 3.4.
Graphs of Functions 27
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
28/31
[4 marks](c) From your graph, find
(i) the value ofy whenx = 0.7 ,
(ii) the value ofx when 01053 =+ xx .[2 marks]
(d) Draw a suitable straight line on your graph to find all the values ofx which
satisfy the equation 0263
= xx for -3.4 x 3.4.
State these values ofx.[4 marks]
Answer:
(a) k = ..
m = .
(b)Refer graph on page 33
(c) (i) y = ..
(ii) x = .
(d) x = ..
3. Nov 2004, Q12
(a) Table 1 shows values ofx andy which satisfy the equation 342 2 = xxy .
x -2 -1 0 1 2 3 4 4.5 5
y k 3 -3 -5 -3 m 13 19.5 27
Table 1
Calculate the value ofkand ofm. [2 marks]
(b) For this part of the question, use the graph paper. You may use a flexible curve.By using a scale of 2 cm to 1 unit on thex-axis and 2 cm to 5 units on they-axis,
draw the graph of 3422
= xxy for -2 x 5.[5 marks]
(c) From your graph, find
i. the value ofy whenx = -1.5,
ii. the value ofx wheny = 0.[2 marks]
(d) Draw a suitable straight line on your graph to find a value ofx which satisfies the
equation 02322
=+ xx for -2 x 5.
Graphs of Functions 28
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
29/31
State this value ofx.[3 marks]
4. Nov 2005, Q12
(a) Complete Table 2 for equation 32 2 = xxy .
x -2 -1 0.5 1 2 3 4 4.5 5
y 7 -2 -2 3 12 33 42
Table 2
[2 marks]
(b) For this part of the question, use the graph paper. You may use a flexible curve.By using a scale of 2 cm to 1 unit on the x-axis and 2 cm to 5 units on the y-
axis, draw the graph of 322
= xxy for -2 x 5.
[4 marks](c) From your graph, find
i. the value ofy whenx = 3.6,
ii. the value ofx wheny = 37.[2 marks]
(d) Draw a suitable straight line on your graph to find all value ofx which satisfy the
equation 10322
= xx for -2 x 5.
State these values ofx.
5. July 2005, Q12
(a) Complete Table 1 in the answer space for the equation2
23 xxy = .[2 mark]
Answer:
(a)
x -3 -2 -1 0 1 2 3 3.5 4
y -12 -3 3 0 -7 -25 -33
TABLE 1
(b) For this part of the question, use the graph paper provided on page 33.You may use a flexible curve rule.
By using a scale of 2 cm to 1 unit on thex-axis and 2 cm to 5 units on they-axis,
draw the graph of 223 xxy = for -3 x 4.
[4 marks]
Answer:
Graphs of Functions 29
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
30/31
(b) Refer graph on page 33 .
(c) From your graph, find
(i) the value ofy when x = 1.7 ,
(ii) the value ofx when y = 26 .
Answer:
(c) (i) y = .
(ii) x =
(d) Draw a suitable straight line on your graph to find all the values ofx which
satisfy the equation 022
118
2=+ xx for -3 x 4.
State these values ofx.[4 marks]
Answer:
(d) x = ,
6. July 2006, Q12
(a) Complete Table 2 in the answer space for the equation 383
+= xxy
by writing down the values ofy when x = -2 and 2 .[2 marks ]
(b) For this part of the question, use the graph paper provided on page 35.You may use a flexible curve rule.
By using a scale of 2 cm to 1 unit on thex-axis and 2 cm to 5 units on they-axis,
draw the graph of 383 += xxy for -3.5 x 3.5 .
[4 marks]
(c) From your graph, find
(i) the value ofy when x = 0.7 ,
(ii) the value ofx when y = 9 .[2 marks ]
(d) Draw a suitable straight line on your graph to find all the values ofx which
satisfy the equation 8133
= xx for -3.5 x 3.5 .State these values ofx.
[4 marks]
Answer:
(a)
x -3 -2 -1 0 1 2 3 3.5 4
y -12 -3 3 0 -7 -25 -33
Graphs of Functions 30
-
8/6/2019 Chapter 11 II Graphs of Functions Enhancement
31/31
TABLE 1
(b) Refer graph on page 33 .
(c) (i) y = .
(ii) x =
(d) x = ,
7. Nov 2006, Q13
(a) Complete Table 1 in the answer space for the equation y =x
24by writing down
the value of y when x = -3 and x = 1.5. [2 marks ]
(b) For this part of the question, use the graph paper provided on page 35. You mayuse a flexible curve rule.
By using a scale of 2cm to 1 unit on the x-axis and 2 cm to 5 units on the y-axis,
draw the graph of y =x
24for 44 x . [5 marks ]
(c) From your graph, find
i. the value of y when x = 2.9
ii. the value of x when y = -13.
[ 2 marks ]
(d) Draw a suitable line on your graph to find a value of x which satisfies the
equation 2x2
+ 5x = 24 for44
x .State this value of x.
[ 3 marks ]
Answer :
(a)
x -4 -3 -2 -1 1 1.5 2 3 4
y -6 -12 -24 24 12 8 6
TABLE 1
(b) Refer graph on page 35(c) (i) y = ..
(ii) x = ..
(d) x = ..