Section 1

1. Section 1

1.21. Lesson 2 Summary

Mathematics 20-3 Module 3

Section 1: Slope—Physical Objects

Lesson 2 Summary

In this lesson you discovered how to calculate slope. You also described situations where the slope is constant, equal to zero, or undefined. You viewed each of these situations in relation to a roller coaster.

This illustration shows a grid with a blue vertical line, a red horizontal line, and a green oblique line.

Horizontal lines, like the red line segment, have a slope of zero because there is no rise.

Vertical lines, like the blue line segment, have an undefined slope because there is no run.

Oblique lines, like the green line segment, have slope found by dividing rise by run.

You saw that a straight line has a constant slope. You also determined that curved lines have slopes that change depending on what points you use to calculate their slopes.