Respostas

2014-07-23T00:19:34-03:00
A) y = 2

2x + 2y = 1
2x + 2.(2) = 1
2x + 4 = 1
2x = 1 - 4
2x = -3

x =  \frac{-3}{2}


B) y = 4

2x + 2y = 1
2x + 2.(4) = 1
2x + 8 = 1
2x = 1 - 8
2x = -7

x =  \frac{-7}{2}


C) y = -2

2x + 2y = 1
2x + 2.(-2) = 1
2x - 4 = 1
2x = 1 + 4
2x = 5
x = 5 ÷ 2
x = 2,5


D) y = 0

2x + 2y = 1
2x + 2.(0) = 1
2x + 0 = 1
2x = 1
x = 1 ÷ 2
x = 0,5