Respostas

2013-12-14T19:06:31-02:00


x+2y = 6 (.-2)

-2x -4y = 12
2x -3y = 12
-7y = 24
y = 24/7

x + 2(24/7) = 6
x + 28/7 = 6
x + 4 = 6
x = 6 -4
x = -2
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