Respostas

2014-05-22T18:01:58-03:00
[2x 6] + [3x -10] =[10 -4]
[y-2 7]    [3y 6]     [3 12]

2x + 3x = 10
5x = 10
x = 10/5
x = 2

agora o valor de y

y-2 +3y = 3
y + 3y = 3 + 2
4y = 5
y = 5/4
1 5 1