jvoliveiraneonp55fex 12/06/2013 x+y=21 x/y=5/2 x=(5/2)y (5/2).y+y=21 7y/2=21 7y=42 y=42/7 y=6 x=21-6 x=15
jvoliveiraneonp55fex
x+y=21
x/y=5/2 x=(5/2)y
(5/2).y+y=21
7y/2=21
7y=42
y=42/7
y=6
x=21-6
x=15