x+y=9
-3x+y=-11 (x-1)
3x-y=11
————
4x=20
x=5
Sendo x=5
5+y=9
y=4
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x+y=9
-3x+y=-11 (x-1)
x+y=9
3x-y=11
————
4x=20
x=5
x+y=9
Sendo x=5
5+y=9
y=4