Respuestas

2012-07-21T22:22:03+02:00

x+6y=27

7x-3y=9

 

x=27-6y

7x-3y=9

 

7(27-6y)-3y=9

189-42y-3y=9

-45y=-180

y=4

 

x=27-6*4

x=27-24

x=3