Lesson objective: Fluently interpret the slope and intercept of a line of best fit for a scatter plot in the context of the independent and dependent variables.

This lesson helps to build fluency with interpreting the slope and intercept of a line of best fit. A line of best is used here because it highlights the slope and intercept of a linear model. This work develops students' understanding that bivariate data may not have an exact linear association, but a linear model is often used to describe the association.

Students engage in Mathematical Practice 5 (Use appropriate tools strategically) as they interpret the slope and intercept of a line of best fit.

**Key vocabulary:**

- bivariate data
- dependent variable
- independent variable
- intercept
- line of best fit
- rate of change
- slope
- y-intercept