Respostas

2014-01-07T22:59:39-02:00
0-4y=-15
-4y=-15
y= -15/-4
y= 15/4
1 2 1
2014-01-07T23:00:58-02:00
0 - 4y = - 15
- 4y = - 15
y = - 15 ÷ (- 4)
y = 3,75 ou 15/4
1 2 1