Respuestas

2012-05-18T18:43:14+02:00

x - $100

y - $50

 

100x+50y=8400

x+y=120

 

100x+50y=8400

x=120-y

 

100(120-y)+50y=8400

12000-100y+50y=8400

-50y=-3600

y=72

 

x=120-72

x=48