Resposta :
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
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