x+y= 12 .(2)
2x+4y=34
2x+2y= 24
cortando 2x com 2x
6y=58 2x+2.13=24
y=58/6 2x+26=24
y= 13 2x=24-26
2x=2
x=1
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y=12-x
2x+4y=34
2x+4(12-x)=34
2x+48-4x=34
2x-4x=34-48
-2x=-14
x=-14/-2
x=7
y=12-x
y=12-7
y=5
x.y
7.5
35
Alternativa 2
x+y= 12 .(2)
2x+4y=34
2x+2y= 24
2x+4y=34
cortando 2x com 2x
6y=58 2x+2.13=24
y=58/6 2x+26=24
y= 13 2x=24-26
2x=2
x=1