This lesson on graphing lines explores the concepts of parallel and perpendicular lines in relation to their slopes. Parallel lines have the same slope but different y-intercepts, while perpendicular lines have slopes that are opposite reciprocals of each other, with the product of their slopes being negative one. Through examples and practice problems, viewers can learn how to determine if two lines are parallel or perpendicular without graphing them, as well as how to find the slope of a line parallel or perpendicular to a given line.
Covers parallel and perpendicular lines in relation to their slopes. This is part 23 of a series of videos about graphing lines.
More free YouTube videos by Julie Harland are organized at http://yourmathgal.com