Respostas

2013-12-15T23:07:24-02:00
A) x + 2x = 5
    3x = 5
    x = 5/3

b) 12 - 6d = 
     -6d = - 12    x(-1)
      6d = 12
       d = 12/6
       d = 2

c) 7c + 4 - 8 - 3c =
   7c - 3c = 8 - 4
   4c = 4
    c = 4/4
    c = 1


d) -9y + 2(5y - 2) =
   -9y + 10y - 4 = 
     y = 4


e) 4s + 3s ( 20 :5) + 6
   4s + 3s ( 4) + 6=
   4s + 12s + 6 = 
   16s = -6
     s = - 6/ 16
    s = -3 / 8

f) ( 4 + 3t) . 3 - 8t - 7
   4 + 3t . 3 - 8t - 7
    4 + 9t - 8t - 7 =
    t = 7 - 4
    t = 3