Respostas

2014-06-06T13:19:11-03:00
2x + y =4      (× 3)
4x - 3y = 3

6x + 3y = 12
4x - 3y = 3
≡ 10x = 15
x =15/10
x =  1,5

2x + y = 4
2(1,5) + y = 4
3 + y = 4
y = 4 - 3
y = 1
6 4 6