The given table shows the number of color pages a printer prints out over a period of time. Printed Pages in Color Time (min), x 2 6 8 18 Number of pages, y 3 9 12 27 What is the constant of variation?

For a direct variation, the constant is y ÷ x. Using the first pair, 3 ÷ 2 = 3/2; the other pairs give the same ratio (9 ÷ 6 = 3/2, for example). The constant of variation is 3 halves, choice B.

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