Respostas

2014-08-20T21:46:39-03:00
A) 10y + 4 = 16y- 8
    10y  - 16y = -8 -4
    -4y = -12
     y = +3

B) 9x - 4 = 6x + 8
    9x - 6x = 8 + 4
    3x = 12
    x = 4
1 5 1