Water Cooler

In previous lessons, students encountered linear relationships with positive rates of change and either positive or negative `y`-intercepts. The graphs of all of these relationships had an uphill appearance. In this lesson, students get their first glimpse of lines that visually slope downhill. Students reflect on similarities and differences between lines that slope in different directions.

By Desmos Classroom

Learning goals: Learning Goals • Understand the difference in visual appearance between lines with positive slopes and lines with negative slopes. • Interpret a line with a negative slope that represents a real-world situation.