Respostas

2014-08-07T12:46:12-03:00
A) 2x+x=10-x
2x+x+x=10
4x=10
x=10/4
x=5/2

B) x+y=2
2x+3y=8

x=2-y
2(2-Y)+3y=8
4-2y+3y=8
-2y+3y=8-4
y=4