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2014-01-08T14:34:36-02:00
X - 2y = 9 
2y = x - 9 
y =  \frac{x - 9}{2}

 \frac{x-9}{2} = 0

x- 9 = 2.0 
x - 9 = 0 
x = 9 
2014-01-08T15:05:03-02:00
Olá, Lilia


X-2Y=9
 Y= 9-X:2


Y= 9-X:2
 -9-X:2=0
-9-X=0.2
 x=0:9
 x=0