Algebra Textbooks Boundless Algebra Linear Functions Working With Lines
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Parallel and Perpendicular Lines

Perpendicular lines

Perpendicular lines

The line $f(x)=3x-2$ in red is perpendicular to line $g(x)=\frac{-1}{3}x+1$ in blue. The values of their slopes are negative reciprocals of each other; therefore, the angle of intersection is $90$ degrees.

Source

    Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:

    "Original figure by Julien Coyne. Licensed CC BY-SA 4.0."
    Julien Coyne CC BY-SA 3.0.

Related Terms

  • perpendicular lines
  • parallel lines
  • reciprocal