Respostas

2013-09-07T16:58:43-03:00
2x+y = 4 -> y = 4 - 2x
4x-3y = 3
4x - 3(4 - 2x) = 3
4x - 12 + 6x = 3
10x = 3 + 12
10x = 15
x = 15/10 = 3/2

2.3/2 + y = 4
6/2 + y = 4
3 + y = 4
y = 1
3 5 3