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Math·Algebra·Linear equations in two variables

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The cost of renting a piece of construction equipment for up to 5 days is $230 for the first day and $115 for each additional day. Which of the following equations gives the cost $y$, in dollars, of renting the equipment for $x$ days, where $x$ is a positive integer and $x\le 5$?

A

$y=230x+115$

B

$y=230x-115$

C

$y=115x+230$

D

$y=115x+115$