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2x - y = -7
4(x + 1) + 2y = 18
2x-y= -7
4x+4+2y=18
2x-y= -7 /2
2x+2y=14
4x-2y= -14
2x+2y=14 +
----------------
2x=0
x=0
0-y= -7
y=7
4x+4+2(2x+7)=18
8x+18=18
8x=18-18
8x=0
y= 2*0 + 7 x=0
y=7 y=7
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2x-y= -7
4x+4+2y=18
2x-y= -7 /2
2x+2y=14
4x-2y= -14
2x+2y=14 +
----------------
2x=0
x=0
2x-y= -7
0-y= -7
y=7
2x - y = -7
4(x + 1) + 2y = 18
4x+4+2(2x+7)=18
8x+18=18
8x=18-18
8x=0
x=0
y= 2*0 + 7 x=0
y=7 y=7