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2014-01-28T14:00:36-02:00
X = peru
y = coelho

x + y = 30 .(-2)
2x + 4y = 86

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-2x -2y = -60
2x + 4y = 86

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soma

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2y = 26
y = 13

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x+y = 30
x + 13 = 30
x = 17


2 5 2
2014-01-28T14:12:43-02:00
x= perus
y= coelhos

x+y=30                   -2
2x+4y=86

-2x-2y=-60
2x+4y=86

2y=26
y=26/2
y=13

x+y=30
x+13=30
x=30-13
x=17