Respuestas

2012-12-29T02:38:53+01:00

X+Y = 14

 

X*Y =3(x-Y) +9

X(14-X) = 3(X-14+X) +9

14X -X^2  - 6X -42 +9= 0

 

X^2-8X -33= 0

(X-11)(X+3)= 0

 

X - 11 = 0

X = 11

 

11 + Y =14   Y = 3