Respuestas

2011-12-01T23:31:38+01:00

{x + y =600

{2x - y = 0

 

{x = 600 - y

{2(600-y) -y = 0

 

{x = 600 - y

{1200 - 2y - y = 0

 

{x = 600 - y

{-3y = -1200 | : (-3)

 

{x = 600 - y

{y = 400

 

{x = 600 - 400

{y = 400

 

{x = 200

{y = 400