This is the "3.7: Perpendicular Lines in the Coordinate Plane" page of the "Geometry Chapter 3" guide.
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Geometry Chapter 3   Tags: geometry, mahlman, math  

Last Updated: Feb 19, 2014 URL: http://libguides.mpsaz.net/content.php?pid=109598 Print Guide RSS Updates

3.7: Perpendicular Lines in the Coordinate Plane Print Page
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Theorems

Writing Equations:

           y = mx + b

           Perpendicular Lines have the negative inverse slopes.

             

  Examples

  1. Find the equation of a line that is perpendicular to y = 5x + 7 and goes through (2, 3).

           

y = mx + b

M

B

II have same slope

y = 5 x + 7

My slope is 1/5

y = 1/5+ 13/5 

Plug in the point

and solve for b.

                  (2, 3)             

          y = 1/5x + b 

          1/5(2) + b

          2/5 + b

          13/5 = b

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