Respostas

2013-12-09T11:23:46-02:00
A)
2x + y = 1 .(4)
3x - 4y = 29

8x + 4y = 4
3x - 4y = 29
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11x = 33
x = 33/11
x = 3

2x + y = 1
2.3 + y = 1
6 + y = 1
y = 1-6
y = -5