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The table shows the ratio between the number of books ordered and their cost:
Number of Books

Cost (dollars)

7

21

8

24

9

27
Find equivalent ratios when the number of books ordered is 1, 2, and 3. Write them as ordered pairs in the form (x-coordinate, y-coordinate). Starting from the origin, explain how to plot the three equivalent ratios on a coordinate grid. (10 points)