Respostas

2014-08-13T22:32:59-03:00
Olá, MayaraMartins2002!

3y - 20 = y + 80
2y - y = 80 + 20
2y = 100
y = 100 / 2
y = 50
2014-08-13T22:34:09-03:00
3y-y=80+20
2y= 100
y=100/20
Y= 5