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Verifying Lines are Perpendicular

  1. Mar 31, 2012 #1
    Just a quick question here. Have I done this correctly? Do I need to factor in the 3 from L?

    Many thanks.

    1. The problem statement, all variables and given/known data

    Q. Verify that the lines L: x -2y + 3 = 0 & K: 2x + y = 0 are perpendicular.

    2. Relevant equations

    3. The attempt at a solution

    x(x) + y(y) = 0 => 1(2) + (-2)(1) = 2 - 2 = 0.
     
  2. jcsd
  3. Mar 31, 2012 #2
    I have no idea what your solution is supposed to show, but verifying that two lines are perpendicular is easy. Just put them in y=mx+b form and compare them. If their slopes are opposite and reciprocal (2/3, -3/2 for example), then they are perpendicular.
     
  4. Mar 31, 2012 #3
    Ok, thank you.
     
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