4. Mrs. Yuri's classroom has 21 students. She took all of her students to a fieldtrip at the skate station and brought four chaperones. The students, chaperones, and Mrs. Yuri rented either regular skates for $4.25 or inline skates for $7.50 per day. Mrs. Yuri paid a total of $143.00 for skate rentals. Part A: Write a system of equations to represent the number of people who went on the trip and the amount of money the teacher spent. Part B: How many people rented a pair of regular skates? Part C: How many people rented a pair of inline skates?

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.