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OpenStudy (anonymous):
Write an equation in y = mx + b form for the table. # books purchased 1 2 3 4 Cost of book club 21 30 39 48 A. y = 3x + 21 B. y = 9x + 12 C. y = 5x + 21 D. y = 7x + 12
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OpenStudy (anonymous):
@geishaology
OpenStudy (ddcamp):
b is the output when the input is 0. Since 21 is the value when x (books purchased) is 1, b can not be 21. m is the slope, the amount that y changes when x changes. When the number of books purchased goes up by one, what does the cost of the book club go up by?
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