Brett is a server at an all-you-can eat sushi restaurant. At one table, the customers ordered 3 child buffets and 1 adult buffet, which cost a total of $65. At another table, the customers ordered 3 child buffets and 3 adult buffets, paying a total of $111. How much does the buffet cost for each child and adult?

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.