Respostas

2013-10-03T12:38:29-03:00
-2y - 2y = 3 + 1
-4y = 4 (-1)
y = -1
2013-10-03T12:39:21-03:00
-2Y-1 = 2Y+3
-2Y-2Y = 3+1
-4Y=4.(-1)
4Y = -4
Y=-4/4
Y = -1