a)2x+2y=8
2x-3y=-7 /*-1
2x+2y=8
-2x+3y=7
------------
5y=15
y=3
2x+2*3=8
x=1
b)4(x-2)-(y-2)=1
10x-2y=18
4x-y=7 /*-2
-8x+2y=-14
2x=4
x=2
4*2-y=7
y=1
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a)2x+2y=8
2x-3y=-7 /*-1
2x+2y=8
-2x+3y=7
------------
5y=15
y=3
2x+2*3=8
x=1
b)4(x-2)-(y-2)=1
10x-2y=18
4x-y=7 /*-2
10x-2y=18
-8x+2y=-14
10x-2y=18
------------
2x=4
x=2
4*2-y=7
y=1