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Solve using elimination.

-10x + 3y = 1

-8x + 3y = 5

Guest Apr 19, 2017
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-10x + 3y  =  1       multiply through by -1   =  10x - 3y = -1   (1)

-8x + 3y   =  5       (2)

 

Add  (1)  to (2)   

 

2x  =   4      divide both sides by 2

x  = 2

 

Sub this into  (1)  to find y

 

10(2)  - 3y   =  -1

20  - 3y   =  -1       subtract 20  from both sides

 

-3y   =   -21         divide both sides by -3

 y  =  7

 

So   (x,y)   =  (2, 7)

 

 

 

cool cool cool

CPhill  Apr 19, 2017

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