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3x-2y=2 5x-5y=10

Guest Oct 21, 2017
 #1
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+2

3x-2y=2  (1)

5x-5y=10   divide through by 5 → x - y  =  2 ..add y to both sides → x = 2 + y  (2) 

 

Sub (2) into (1)

 

3(2 + y) - 2y  = 2

6 + 3y - 2y  = 2

6 + y  = 2    subtract 6 from both sides

y = -4

 

And using  (2),   x = 2 + y →  2 + (-4) →  -2

 

 

cool cool cool

CPhill  Oct 21, 2017

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