An instructor gives regular 20point quizzes and 100point exams in a mathematics course. Average scores for six students, given as ordered pairs (x,y) where x is the average quiz score and y is the average test score, are (18, 87), (10, 55), (19, 96), (16, 79), (13, 76), and (15, 82). Use the calculator to find a function that will predict a student's average test grade as a function of this quiz average.
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