Respostas

2014-08-06T15:45:44-03:00
X + 4y = 12
x = 12 - 4y

-2(12 - 4y) - 3y = -9
-24 + 8y - 3y = -9
8y - 3y = -9 + 24
5y = 15
y = 15/5
y = 3

x = 12 - 4y
x = 12 - 4  X 3
x = 12 - 12
x = 0

1 5 1