Respostas

2013-08-14T21:37:35-03:00
X+y=13
x.y=36
x=13-y
(13-y).y=36
13y-y2-36=0
-y2+13y-36=0
usando baskara

169 - 144 = 25

-13 + ou -raizde25/-2

-13+5/ -2

-8/ -2 = 4 = x

x.y=36

4y=36

y= 9
1 5 1