Respostas

2014-02-07T09:44:18-02:00
10 - 4y = y 
-4y -y = -10
-5y = -10
y = -10 / - 5
y = 2
5 4 5
2014-02-07T09:44:56-02:00
- 4y - y = -10
-5y = -10 (multiplicando por: (-1)
5y =10
y = 10/5
y = 2