2400x+4800y=700xy 24x+48y=7xy

(24x+24y)/(24x+48y)=5xy/7xy

1-24y/(24x+48y)=5/7

24y/(24x+48y)=2/7

168y=48x+96y

72y=48x

3y=2x

24x+24y=5xy

48x+48y= 10xy

72y+48y= 15y？

y？ -8y=0

y(y-8)=0

Y=0 or y=8.

When y=0, x=0.

When y=8, x= 12.