Ezra is finding the perimeter of different-sized regular pentagons. There is a proportional relationship between the side length of the regular pentagon In Inches,

x, and the perimeter of the regular pentagon in inches, y.

x (side length in inches) y (perimeter in inches)

1

5

2

10

3

15

4

20

What is the constant of proportionality? Write your answer as a whole number or decimal.

inches in perimeter per inch in side length

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