Seth is participating in a fun run to raise money for the West Side Children's Hospital. The run is held at Seth's high school track. The more laps Seth runs around the track, the more money he

raises for the hospital.

There is a proportional relationship between the number of laps Seth runs, x, and the amount of

money he raises for the hospital (in dollars), y.

x (laps) y (dollars)

1

$5

2.

$10

3

$15

4

$20

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

dollars per lap