+0  
 
+5
364
1
avatar+266 

2x+6y=-12

5x-5y=10

 Oct 14, 2015
 #1
avatar+111321 
+5

2x+6y=-12     divide everything by 2    →   x + 3y  = -6

5x-5y=10       divide everything by -5   →  - x + y  = -2

 

Notice, Paypay, that if we just add these last two together, we have :

 

4y = - 8      divide by 4 on both sides

 

y = -2

 

And using  -x + y = -2   →    -x - 2  = -2       so x =  0

 

 

cool cool cool

 Oct 14, 2015

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