Geometry question need help ASAP find the value of x

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

Abcd is a square. what is the measure of angle bac

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.