# Perpendicular line equations

A perpendicular line is a straight line through a point. It makes an angle of 90 degrees with a particular point through which the line passes. Coordinates and line equation is the prerequisite  Algebra 1 : How to find the equation of a perpendicular line

Find the equation of a line that passes through the point ( 5, − 7) and is perpendicular to the line y = − 1 3 x − 9. First, find the slope of the given line. This line is in

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Terry Deas ## Perpendicular Line Calculator

So here m is equal to negative 1/3. So we already see they are the negative inverse of each other. You take the inverse of 3, it's 1/3, and then it's the negative of that. Or you take the inverse of negative 1/3, it's
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## How to Find the Equation of a Perpendicular Line: 11 Steps

Draw an arc from X in the upper part of the line PQ. Keep the radius the same and cut an arc from Point Y, intersecting the previous arc at B. Join A and B using a ruler. Extend it if needed. The lines AB and PQ are perpendicular to each other.

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• Clear up mathematic problems

Math can be confusing, but there are ways to make it easier. One way is to clear up the equations.

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