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-3x+5y=22 12x-10y=-8

Guest Mar 20, 2017
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-3x+5y = 22       multiply through by 4  →   -12x + 20y = 88   (1) 

12x-10y = -8       (2)

 

Add (1) to (2)  and we have

 

10y  = 80      divide by 10

 

y = 8

 

Sub this into  -3x + 5y = 22  to find x

 

-3x + 5(8) = 22

 

-3x + 40  = 22     subtract 40 from both sides

 

-3x   =  - 18        divide both sides by -3

 

x =  6

 

 

cool cool cool

CPhill  Mar 20, 2017

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