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Math·Algebra·Linear functions

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A book-of-the-month club charges $17 for the first book purchased during the month and an additional $13 for each book after the first. Which equation describes this situation, where $y$ is the total cost, in dollars, for books purchased during a month, $x$ is the number of books purchased during the month, and $x>0$?

A

$y=x+17$

B

$y=13x+17$

C

$y=13(x-1)+17$

D

$y=(x-1)+17$