Objective
To relate slope to parallel and perpendicular lines
In the Solve It, slope represents the running rate, or speed. According to the graph, you and your friend run at the same speed, so the slopes of the lines are the same. In this lesson, you will learn how to use slopes to determine how two lines relate graphically to each other.
Essential Understanding You can determine whether two lines are parallel or perpendicular by comparing their slopes.
When two lines are parallel, their slopes are the same.