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Perpendicular lines

  1. Jan 26, 2004 #1
    Could some tell me whats the other way you could find if lines are perpendicular, other than graphing. I know another way to do it, and its algebracaly, but theres another way you could do it algebracaly too.
  2. jcsd
  3. Jan 27, 2004 #2
    Find the slope for the two lines
    Their product should be equal to -1 if the lines are perpendicular
  4. Jan 27, 2004 #3


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    Staff Emeritus
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    Form a unit vector along each line, with components. Then do an inner product of the vectors to see if it's zero. Same work in a different dress.
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