Ответ:
1)y+2=1
y=1-2
y=-1
2)x-y=2
x-y-2=2-2
x-y-2=0
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Ответ:
1)y+2=1
y=1-2
y=-1
2)x-y=2
x-y-2=2-2
x-y-2=0