what is the answer for x and y in this equation 2x-2y=8

the sheet says solve each system by substitution so #1 would be y=x-1and the 2 equation would be y=2x-1
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1 Answer

2x+2y=8

2y=8-2x

y=-x+4...formula for strate line with slope=-1 & y-ingersept=4

????????????????? substitute ???????????
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