How are the slopes of perpendicular lines related? It turns out they are always opposite reciprocals. A video instructor emphasizes this fact with graphs, examples, and symbolic representations. He follows that instruction with demonstrations of writing the equation of perpendicular lines.

Concepts

parallel lines, perpendicular lines, linear equations, linear equations writing, slope, y-intercepts

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Additional Tags

math

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Instructional Ideas

• Pair with the video on parallel lines from the same author
• Flip your classroom by assigning the video lesson as homework; use class time to complete the practice problems

Classroom Considerations

• Requires the skills needed to write a linear equation given a point and slope

Pros

• Provides an answer key to practice problems
• Incorporates color to emphasize important concepts

Cons

• None

Common Core

SL.8.2 SL.9-10.2 RST.6-8.7 RST.9-10.7