Explicación paso a paso:
1)
x-y=5
x+y=7
2x=12
x=6
y=1
2)
x+y=12
x-y=6
2x=18
x=9
y=3
3)
x+y=5
x-y=3
2x=8
x=4
4)
x-y=1
2x=6
x=3
y=2
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Explicación paso a paso:
1)
x-y=5
x+y=7
2x=12
x=6
y=1
2)
x+y=12
x-y=6
2x=18
x=9
y=3
3)
x+y=5
x-y=3
2x=8
x=4
y=1
4)
x+y=5
x-y=1
2x=6
x=3
y=2