Respostas

2014-05-25T20:49:30-03:00
3x-y = 11 ---- y = 3x - 11

2x- 2y = 2
2x - 2(3x -11) = 2
2x - 6x + 22 = 2
4x = 20
x = 5

y = 3x - 11
y = 3.5 -11
y= 15 - 11
y = 4