# 13.5 - 13-5 Parallel and Perpendicular Lines A Theorem 13-2...

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Unformatted text preview: 13-5 Parallel and Perpendicular Lines A) Theorem 13-2 a. Two nonvertical lines are parallel if and only if they have the same slope, () b. B) Theorem 13-3 a. Two non vertical lines are perpendicular if and only if their slopes are negative reciprocals of each other b. Or if the product of their slopes is -1 then they are perpendicular i. C) Examples a. Find the slopes of the triangle A(-3,1), B(3,4), C(0,-4) b. Find the slopes of the altitudes of the triangle D) If the line containing points (4x,0) and (0,8x) is parallel to the line containing points (0,18x) and (9x,0), what must be the value of x? ...
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## This note was uploaded on 05/16/2011 for the course ALGEBRA 098 taught by Professor Johnson during the Spring '09 term at Grand Valley State.

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