At A Glance

Parallel and Perpendicular Lines

Check out Bas Rutten's Liver Shot on MMA Surge: http://bit.ly/MMASurgeEp1 In this video, Mahalo math expert Allison Moffett shows you the difference between a parallel and a perpendicular line. If two lines are parallel to each other, that means that they run along side each other and will never intersect. It also means that they have the same slope. So if you have the two equations above, you know that they are parallel even before you graph them because they both have a slope of 2/3. If two lines are perpendicular to each other, that means that they intersect at a 90°?angle. It also means that there slopes are the negative inverse of each other. For example, a line perpendicular to one with a slope of two would have a slope of -1/2, as shown above. To find the slope of a line perpendicular to the line y=(-4/5)x-17, start with the existing slope (-4/5). First, change the sign. Next, flip it to its inverse. That gives you 5/4. Read more by visiting our page at: http://www.mahalo.com/parallel-and-perpendicular-lines/
Length: 04:20

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