Identifying proportional relationships

3 videos
2 skills
Learn how to tell whether two quantities are proportional by thinking about equivalent ratios and drawing graphs.

Introduction to proportional relationships

VIDEO 3:50 minutes
The relationship between two variables is proportional if 

Identifying a proportional relationship from a table (example)

VIDEO 1:03 minutes
Given a table of ratios, watch as we test them for equivalence and determine whether the relationship is proportional.

Identifying proportional relationships

PRACTICE PROBLEMS
Practice telling whether or not the relationship between two quantities is proportional by reasoning about equivalent ratios.

How to visually identify proportional relationships using graphs

VIDEO 7:19 minutes
Learn how to tell proportional relationships by drawing graphs. Key idea: the graph of a proportional relationship is a straight line through the origin.

Identifying proportional relationships with graphs

PRACTICE PROBLEMS
Practice telling whether or not the relationship between two quantities is proportional by looking at a graph of the relationship.