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en.wikipedia.org/wiki/Perpendicular

If two

www.coolmath.com/algebra/08-lines/14-perpendicular-lines-01

Let's graph these

www.khanacademy.org/math/geometry-home/analytic-geometry-topic/parallel-and-perpendicular/v/perpendicular-lines

Sal determines which pairs out of a few given linear equations are

www.khanacademy.org/math/basic-geo/basic-geo-lines/parallel-perp/v/parallel-and-perpendicular-lines-intro

Parallel lines never intersect, and

www.mathsisfun.com/definitions/perpendicular-lines.html

www.mathsisfun.com/perpendicular-parallel.html

www.purplemath.com/modules/slope2.htm

Demonstrates how to determine if slopes are parallel,

www.purplemath.com/modules/strtlneq3.htm

Demonstrates how to find parallel and

www.virtualnerd.com/algebra-1/linear-equation-analysis/parallel-perpendicular-lines/perpendicular-lines/slope-intercept-from-point-and-perpendicular-line

Want to find the slope-intercept form of a line when you're given a point on that
line and another line perpendicular to that line? Remember,

www.mathopenref.com/perpendicular.html

Answers

What Are Perpendicular Lines?

In mathematics, a line is an infinitely long one-dimensional object. It has no start or end, continuing on forever without ever changing direction. More colloquially, a "line" is any straight object, even if it does have an end point. The relationship...
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Difficulty:
Easy

Source:
www.ehow.com