3x-y=4
x+y=8
y=8-x
3x-(8-x)=4
3x-8+x=4
4x-8=4
4x=4+8
4×=12
x=3
y=8-3
y= 5
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3x-y=4
x+y=8
3x-y=4
y=8-x
3x-(8-x)=4
3x-8+x=4
4x-8=4
4x=4+8
4×=12
x=3
y=8-3
y= 5