A) Carly has the most starting, y= -.2x+ 22, the 22 is the starting point and it goes goes down by .2 for every 2 minutes
B) Jill eats her candy faster, with the previous information it can be inferred that the equation for Jill would be y= -x+ 20, meaning Jill is eating a full candy every 2 minutes where as Carly is eating 1 full candy every 10 minutes.