Mary is trying to save money for a car. the equation y= 250x+1000 represents how much she saves, where y is the amount in her savings account and x is the number of months. how long will it take her to save $10,000

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.