Lesson objective: Fluently identify and interpret the constant of proportionality from tables and graphs.

This lesson helps to build fluency with identifying the constant of proportionality from tables and graphs. Graphs and tables are used here because it develops understanding of proportional relationships in real situations. This work develops students' understanding that the constant of proportionality describes how one quantity changes while the other quanity changes by one.

Students engage in Mathematical Practice 4 (model with mathematics) as they compute and interpret the constant of proportionality from tables and graphs.

**Key vocabulary:**

- contant of proportionality
- unit rate