solving systems of equations: the elimination method solving systems of equations: the elimination...
Post on 18-Jan-2016
228 Views
Preview:
TRANSCRIPT
Solving Systems of Equations:Solving Systems of Equations:The Elimination MethodThe Elimination Method
Solving Systems of Equations:Solving Systems of Equations:The Elimination MethodThe Elimination Method
Example 1
x – y = 7 x + y = 3
2x + 0y = 102x = 10
x = 5
x + y = 35 + y = 3
y = -2
(5,-2)
Solve using the elimination method.
REMEMBER:Always check yoursolution in the originalequations!
Example 2
2x + 3y = 11-2x + 9y = 10x + 12y = 12 12y =
12y = 1
2x + 3y = 112x + 3(1) =
112x + 3 = 11 2x = 8
x = 4
(4,1)
Solve using the elimination method.
Example 3Solve using the elimination method.
3x – y = 8x + 2y = 5x + 2y = 5
write in standard form
3x – y = 8multiply as needed(-3)( )
( )(-3)
3x – y = 8-3x – 6y = -
15addition property
-7y = -7 y = 1
3x - (1) = 8 3x = 9
x = 3
(3,1)
Example 4
8x 2y 10
4x 15 3y
4x – 3y = 15
write in standard form
8x + 2y = -10 multiply as needed(-2)( ) ( )(-2)
8x + 2y = -10-8x + 6y = -30 addition property
8y = -40y = -
5
8x + 2(-5) = -10 8x - 10 = -
10 8x = 0x = 0(0,-5)
Solve using the elimination method.
Practice
1)
Solve using the elimination method.
x y 5
2x y 4
2)
3x 3y 6
3x 3y 0
5x 3y 17
5x 2y 3
8x 11y 37
11y 7 2x
3) 4)
5) 2x + ⅔y = 4 x - ½y = 7
top related