SOLUTION: The cost of 5 boxes of cookies is 15 dollars. Which equation shows this in function notation?

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Question 299958: The cost of 5 boxes of cookies is 15 dollars. Which equation shows this in function notation?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
First find the cost of 1 box
15%2F5+=+3 dollars/box
Let x = number of boxes
f%28x%29 = cost of x boxes
f%28x%29+=+15%2A%28x%2F5%29
f%28x%29+=+3x