Key Concepts

• The constant of proportionality is the _______ value of the ratio between two proportional quantities.

• To find the constant of proportionality on a graph, find the y-value when the x-value is
________ .

• You can use ______ reasoning to find the constant of proportionality when the x-value of 1 is not labeled on a graph.

• A proportional relationship is sometimes described by words. Setting up a table to find the _______ of proportionality can be useful.