Respostas

2013-09-30T18:55:05-03:00
X+2y=1  (-5)
3x-5y=3  (2)

-5x-10y= -5
6x-10y=3
x= 2

3(2) -5y=3
6-5y=3
5y= 3-6
y= -3/5
2 4 2