# Math Help - Perpendicular Slope

1. ## Perpendicular Slope

How do you find perpendicular slope is it: Y sub 1 minus Y sub 2 divided by X sub 1 minus X sub 2.?

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2. Originally Posted by zachcumer
How do you find perpendicular slope is it: Y sub 1 minus Y sub 2 divided by X sub 1 minus X sub 2.?

Best
Say you have two coordinates $(x_1,y_1)$ and $(x_2,y_2)$.

The slope is simply: $\frac{y_2-y_1}{x_2-x_1}$

Perpendicular slope, and the tangent normal to this point is the opposite reciprocal of that slope: $\frac{x_1-x_2}{y_2-y_1}$