Respostas

2014-04-29T20:42:11-03:00
Vc iguala os termos q equivalem as respectivas letras (X e Y):

(3x + 2) = (2x - 1)
3x - 2x = -1 -2
x = -3

(2y - 6) = (y + 2)
2y - y = 2 + 6
y = 8