Respostas

2014-05-29T23:22:03-03:00
X=108/y
(108/y)-6+y-6=9
(108/y)=9+12-y
(108/y)=21-y
108=(21-y).y
108=21y-y²
y
²-21y+108=0
21+-(
√441-4.1.108)/2
21+-(√9)/2
x1=(21+3)/2=12
x2=(21-3)/2=9

x.y=108
y=108/x
y1=108/12=9
y2=108/9=12