Respostas

2013-11-03T12:37:59-02:00
{2x-y=0
{x+y=15
3x=15
x=15/3
x=5
3 4 3
2013-11-03T13:08:06-02:00
2x-y=0
x+y=15
3x=15
x=15/3
x=5  
2 4 2