Respostas

2014-08-11T11:02:57-03:00
A) y=2.(0)-1
    y=-1
b)y=2.(2)-1
   y=4-1
   y=3
c)y=2.(5)-1
  y=10-1
 y=9
d)y=2.(1/3)-1
   y=0.5