Respostas

2014-08-27T23:15:32-03:00
{x+y=6 》x= 6-y》x= 6- 8/3》3x= 18-8
{2x-y=4 x= 10/3
2. (6-y) -y= 4
12 - 2y - y= 4
-3y= -8
y= -8/-3.(-1)
y= 8/3