Writing Equations for Perpendicular Lines

Make the right connections between the equations of perpendicular lines. Pupils find the equation of a line perpendicular to another line in the context of finding the equation of a side of a geometric figure. Learners write their equations in slope-intercept form.

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CCSS: Designed
Instructional Ideas

  • Provide the class with a problem of a rectangle on the coordinate plane with only three vertices and have them find the equations of the lines containing the sides
Classroom Considerations

  • Individuals should know the relationship between the slopes of perpendicular lines
  • Class members should be comfortable writing equations in slope-intercept form
Pros

  • Asks the questions in the context of a geometry problem instead of just what is the equation of the line perpendicular to a given line
  • Provides descriptions of common misconceptions
Cons

  • None
Common Core