Respostas

2013-10-13T23:16:42-03:00
2X+Y = -3
X -3Y=26
X= 26-3Y
2(26-3Y) +Y =-3
52 -6Y +Y = -3
-5Y= -55(-1
5Y= 55=> Y = 55/5=> Y= 11
X=26-3Y
X= 26-3(11
X= 26- 33
X=-7