Respostas

2013-11-10T17:39:07-02:00
8x+20y = -24
7x+4y=6  .(-5)

8x+20y = -24
-35x-20y = -30

-27x = -54
x = -54/27
x = -2

8x+20y = -24
8.-2+20y = -24
-16 + 20y = -24
20y = -24 + 16
20y = -8
y = -8/20
y = -2/5
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