In this section we state that two lines, neither of which is vertical, are perpendicular if and

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In this section we state that two lines, neither of which is vertical, are perpendicular if and only if their slopes have a product of -1. we outline a partial proof of this for the case where the two lines intersect at the origin.

y У2%3D т2х У1%3 тух О(хр тр*) Р(x, тх) х


By the converse of the Pythagorean theorem, if
[d(0, P)]? + [d(0, Q)]² = [d(P, Q)]²,


then triangle POQ is a right triangle with right angle at O.

Find an expression for the distance d(P, Q).

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College Algebra

ISBN: 978-0134697024

12th edition

Authors: Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels

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