The local skating rink pays Mary a fixed rate per pupil plus a base amount to work as a skating instructor. She earns $90 for in
structing 15 students on Monday afternoon. Last Friday, she earned $62 for working with 8 students. Lisa is also a skating instructor. She receives half the base amount that Mary does, but she is paid twice as much per student. Who would earn more money instructing a class of 20 students?
The expressions for the payment made to Mary are, (Monday) 90 = 15m + b (Tuesday) 62 = 8m + b where m and b are the fee per student and the base fee, respectively. Solving for m and b, the values are 4 and 30. The equation that represents Mary's earning is y = 4x + 30 For 20 students, y = 4(20) + 30 = 110 For Lisa's earnings, y = 8x + 15 Substituting 20, y =8(20) + 15 = 175 Thus, Lisa would earn more than Mary by $65.