Respostas

2013-11-21T22:24:54-02:00
X +y = 42
x/y=5/9          x=5y/9


5y/9 + y = 42 (mmc = 9)
 5y+9y=378
14y= 378
y=378/14
y=27  

x + y=42
x+27=42
x=42-27
x= 15

S={ (x;y) }

S={ (15;27) }