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2x-y=5
2(y-1)-y=5
2y-2-y=5
y=7
x=6
2x+y=5
y=x+2
2x+x+2=5
3x=3
x=1
y=3
2x-y=5
2(y-1)-y=5
2y-2-y=5
2y-y=5+2
y=7
x=y-1
x=7-1
x=6
1. 2x+y=5
y=x+2
2x+(x+2)=5
2x+x+2=5
3x+2=5
3x=5-2
3x=3 : 3
x=1
y=x+2
y=1+2
y=3