Respostas

2014-08-22T18:44:55-03:00
X=2y
x+y=12
x=12-y
12-y=2y
2y+y=-12
3y=-12
y=-12/3
y=-4
1 5 1
A melhor resposta!
2014-08-22T18:45:17-03:00
X=2y  e  x+y=12
 
2y+y=12
3y=12
y=4

x=2y
x=8
2 5 2