Respostas

2013-11-28T19:46:23-02:00
2x -y= 9         3.3 + y = 6
3x +y= 6           9 + y = 6
---------------          y = 6 - 9
5x = 15              y = -3
x = 15/5
x = 3
1 5 1
2013-11-28T20:03:17-02:00