There's a huge sale at the grocery store, so Larry stocks up on his favorite breakfast cereal, Frosted Crunchy Bunches. As he puts the cereal boxes on a shelf in his pantry, he wonders if he has enough shelf space.
There is a proportional relationship between the number of cereal boxes Larry stores on his pantry shelf, x, and the amount of shelf space (in inches) the boxes take up, y.
x (boxes) y (inches)
2 6
4 12
5 15
6 18
What is the constant of proportionality? Write your answer as a whole number or decimal.
inches per box