Proportional Relationships

A proportional relationship between two quantities is a relationship in which the ratio of one quantity to the other quantity is equivalent.

Proportional Relationships in Equations

A proportional relationship can be written as an equation in the form “y=kx” where the “k” represents a rate.

Proportional Relationships in Graphs

The graph of a proportional relationship is always a straight line (linear) that goes through the origin

Proportional Relationships in Tables

A table represents a proportional relationship when there is a constant rate of change and when the input (x) equals zero and the output (y) equals zero.

Proportional vs Non-proportional

Proportional relationships are always linear however not all linear relationships are proportional. Some linear relationships are non-proportional.


Learn about ratios

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