Respostas

2014-02-05T22:44:37-02:00
X +y =7
y= x+1
x+x+1=7
2x= 7-1
2x=6
x=6/2
x=3
y=4

2014-02-05T22:44:47-02:00
X + (x+1) =7
2x= 7-1
x= 6/2
x=3

Então, x=3 e x+1=4, pois 3+1=4