# 7.RP.A.2

Recognize and represent proportional relationships between quantities.

a Decide whether two quantities are in a proportional relationship, e.g., by testing for equivalent ratios in a table or graphing on a coordinate plane and observing whether the graph is a straight line through the origin.

b Identify the constant of proportionality (unit rate) in tables, graphs, equations, diagrams, and verbal descriptions of proportional relationships.

c Represent proportional relationships by equations. For example, if total cost $t$ is proportional to the number $n$ of items purchased at a constant price $p$, the relationship between the total cost and the number of items can be expressed as $t = pn$.

d Explain what a point $(x, y)$ on the graph of a proportional relationship means in terms of the situation, with special attention to the points $(0, 0)$ and $(1, r)$ where $r$ is the unit rate.

## Tasks

Music Companies, Variation 1
Art Class, Variation 1
Art Class, Variation 2
Buying Coffee
Sore Throats, Variation 1
Robot Races
Robot Races, Assessment Variation
Art Class, Assessment Variation
Buying Bananas, Assessment Version
Scaling angles and polygons
Walk-a-thon 2
Proportionality
Cider versus Juice - Variation 1
Cider versus Juice - Variation 2
Gym Membership Plans