Interactive, Lesson Plan


This resource has been contributed by Winpossible, and can also be accessed on their website by clicking here - Find equation of a line perpendicular to the line with given equation.

In this mini-lesson you'll learn how to find the equation of a line perpendicular to a given line. In such cases, we need to remember that in case of perpendicular lines, the product of their slopes is –1. This gives us a way to find the slope of the required equation -- if the slope of given line is m1, the slope of perpendicular line will be –1/ m1. The steps we need to take are as follows:
  • Calculate slope of the new line as described above
  • Extract other information provided, e.g. the y-intercept, a given point on that line etc.
  • Find the equation of the new line by using the slope and the other information provided to us.

This FREE mini-lesson is a part of Winpossible's online course that covers all topics within Algebra I. Click on the video below to go through it. If you like it, you can buy our online course in Algebra I by clicking here.


  • Mathematics > General
  • Mathematics > Algebra
  • Education > General

Education Levels:

  • Grade 9
  • Grade 10
  • Grade 11
  • Grade 12


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