Respostas

2013-06-12T09:53:29-03:00

3 (2y - 1) = 6y - 3 = Y = 3/6 = 0,5

 

-2 (y- 2 ) = -2y +4 = Y = 4/-2 = - 2

 

4 (y + 3) = 4y + 12 = Y = 12/4 = 3