Jill, meg, and beth are sisters. jill is 2 years younger than meg. beth is half as old as meg. use the same variable to write three algebraic expressions based on this situation. tell what the variable represents and what each expression represents

Three students, javier, sam, and corrine, participated in a fundraiser where people donated a certain amount of money per lap that the student ran. each student also had some initial donations that were collected before the run. the equations that represent each student's total donation, y, based on the number of laps ran, x, is shown below. match each equation with the correct rate of change for that student.