Respostas

2014-04-26T00:08:04-03:00
2x+y=9
2x(-3)=9
2x=9+3
2x=12
x=12/2
x=6
2014-04-26T00:14:25-03:00
x=?
y=-3

2x+y=9

2x+(-3)=9
2x=9+3
2x=12
x=12\2
x=6