A snack mix recipe calls for 10 cups of cereal and 4 cups of pretzel sticks.
What is the constant of proportionality that relates the number of cups of cereal, y, to the number of cups of pretzel sticks, x?
The constant of proportionality, k, can be found by dividing the number of cups of cereal, y, by the number of cups of pretzel sticks, x.
k = y / x
In this case, k = 10 / 4 = 2.