which augmented matrix represents the following system of equations? 1. 2. 3. 4
TRANSCRIPT
Which augmented matrix represents the following system of
equations?
1 2 3 4
0% 0%0%0%
1143
86
xy
yx
11
8
4
6
3
01.
11
8
4
6
3
12.
11
8
3
6
4
13.
11
8
3
6
4
04.
Which matrix represents the following system of equations?
1 2 3
0% 0%0%
4
3
y
x
41
311.
410
3012.
7113.
An ice skating rink does not list their prices. I paid £22.25 for 2 children and 3 adults. The group in front of
me paid £20.50 for 5 children and 1 adults. Which system of equations would allow us to determine the
prices for children and adults
1 2 3 4
0% 0%0%0%
1. 2x + 5y = 22.253x + y = 20.50
2. 2x + 3y = 22.255x + y = 20.50
3. 22.25x + 20.50y = 42.755x + 6y = 11
4. (22.25/2)x + (22.25/3)y = 0(20.50/5)x + (20.50)y = 0
What is the solution to the following system of equations?
2x + 2y = 4x – y = -6
1 2 3 4 5 6
0% 0% 0%0%0%0%
1. x=½ and y=-¼
2. x=2 and y=¼
3. x=-2 and y=4
4. x=2 and y=-4
5. There are an infinite number of solutions
6. There are no solutions
What is the solution to the following system of equations?
4x + 2y = 6-16x - 8y = 12
1 2 3 4 5 6
0% 0% 0%0%0%0%
1. x=3/2 and y=0
2. x=-1/2 and y=4
3. x=0 and y=3
4. x=3 and y=-3
5. There are an infinite number of solutions
6. There are no solutions
Which of the following matrices has an inverse?
1 2 3 4
0% 0%0%0%
21
631.
14
282.
21
973.
28
3124.
Which of the following matrices does not have an inverse?
1 2 3 4 5 6
0% 0% 0%0%0%0%
11
241.
28
142.
12
303.
43
874.
inverses havenot do
above theof one than More5.
inverses have All6.
Let A= . What is the value of A-1?
1 2 3 4
0% 0%0%0%
21
23
31
22
4
11.
21
23
4
12.
31
22
8
13.
21
23
8
14.
1 2 3 4
0% 0%0%0%
? is What .02
70 1
AALet
02
701.
07
202.
07
20
3.
07
12
10
4.
Calculate .
1 2 3 4
0% 0%0%0%
3
23
15
69
3151.
19108
36892.
827
11253.
827
11254.
Let A= and B= .What is the value of AB?
1 2 3 4
0% 0%0%0%
13
45
21
24
411
18241.
61
18142.
32
693.
618
1144.
Let A= and A-1= .Use this information to solve
3x+y=55x+2y=9
What is the value of x?
0% 0%0%0%
25
13
35
12
1. x=2
2. x=0
3. x=1
4. x=-3
If A is a 3x4 matrix and B is a 4x2 matrix, then what is the size of AB?
3x2
4x4
2x3
None
of the
se
0% 0%0%0%
1. 3x2
2. 4x4
3. 2x3
4. None of these
The point is transformed by the matrix . Which is its new position?
1 2 3 4
0% 0%0%0%
2
3
23
12
5
81.
49
262.
1
03.
01
414.
Let and . Calculate .
1 2 3
0% 0%0%
31
62A
511
42B AB
3862
11351.
1135
38622.
1511
2443.
Let A= and B= . Find the
element in row 2, column 1 of the product matrix AB.
131
623
142
32
21
14
Given two matrices A and B, what must be true about their sizes in order to calculate the matrix product AB?
1 2 3
0% 0%0%
1. A and B must have the same number of rows
2. A must have as many rows as B has columns
3. A must have as many columns as B has rows
If A= ,what is AT?
0% 0%0%0%
047
131
297
297
131
0471.
717
933
2102.
012
439
7173.
297
047
1314.
Let A= . Calculate tr(A).
683
714
302
Which of the following is an identity matrix?
1 2 3 4
0% 0%0%0%
01
101.
00
002.
11
113.
10
014.
Which of the following is a symmetric matrix?
1 2 3 4
0% 0%0%0%
278
734
8411.
12
212.
463
631
3123.
31
744.
Which of the following relations shows that matrix addition is
commutative?
A+B
=B+A
A+(
B+C)=(A
+B)+
C
k(A
+B)=kA
+kB
0% 0%0%
1. A+B=B+A
2. A+(B+C)=(A+B)+C
3. k(A+B)=kA+kB
Let and .
Calculate .
1 2 3
0% 0%0%
31
62A
511
42B
BA
217
501.
212
1002.
1511
2443.
The determinant of a matrix A and the determinant of its transpose AT
are not equal.
0% 0%0%
1. True
2. False
3. Don’t know
Calculate the determinant of .
42
13
The determinant of a 2x2 matrix is -7. What is the determinant of the
transpose of this matrix?
Which of the following statements is false?
1 2 3 4
0% 0%0%0%
1. If the determinant of a matrix is zero then the matrix has two identical rows.
2. If a square matrix has two identical rows then its determinant is zero.
3. Both are false.
4. Neither are false.
Which of the following is an upper triangular matrix?
1 2 3 4
0% 0%0%0%
300
750
8011.
138
031
0022.
800
020
0063.
600
408
0024.
Consider . If then this equation has infinitely many
solutions.
Tru
e
Fal
se
0%0%
bax 0a
1. True
2. False
What is the size of this matrix?
2 x
3 3
x 2 6
0% 0%0%
421
79
13
1. 2 x 3
2. 3 x 2
3. 6
If A and B are both 3x2 matrices then which of the following are not
defined?
A+B
ATB
AB
ABT
All
of thes
e a.
..
0% 0% 0%0%0%
1. A+B
2. ATB
3. AB
4. ABT
5. All of these are defined
Let A= and B= . If A and B are equal what is the value of ?
12
63
2
3