Jacob and sarah are saving money to go on a trip. they need at least $1850 in order to go. jacob mows lawns and sarah walks dogs to raise money. jacob charges $15 each time he mows a lawn and sarah charges $10 each time she walks a dog. the number of dog walks that sarah has scheduled is no more than five times the number of lawns jacob has scheduled to mow. sarah will walk at least 65 dogs. write a set of constraints to model the problem, with x representing the number of lawns mowed and y representing the number of dogs walked.