Respostas

2014-02-08T15:44:58-02:00
4x+2y= -2
2x+3y = -7


6x + 5y = -9
4 2 4
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2014-02-08T16:43:04-02:00
4x+2y=-2       
2x+3y=-7          -2

4x+2y=-2
-4x-6y=14

-4y=12  (-1)
4y=-12
y=-12/4
y=-3

4x+2.-3=-2
4x-6=-2
4x=-2+6
4x=4
x=4/4
x=1
7 4 7