Explicación paso a paso:
3x-y=5;y=7-x
3x-(7-x)=5
3x-7+x=5
3x+x=5+7
4x=12
x=12/4
x=3
y=7-3
y=4
3(3)-4=5
9-4=5
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Explicación paso a paso:
3x-y=5;y=7-x
3x-(7-x)=5
3x-7+x=5
3x+x=5+7
4x=12
x=12/4
x=3
y=7-3
y=4
3(3)-4=5
9-4=5