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Unformatted text preview: are nonvertical perpendicular lines. Because horizontal and vertical lines are always perpendicular, then lines having a zero slope and an undefined slope are perpendicular. Example 1 If line l has slope , then 1. any line parallel to line l will have slope ____, and 2. any line perpendicular to line l will have slope ____. 1. 2....
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- Fall '07