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Homework Help: Determine equation given 3 points and 2 lines

  1. Mar 17, 2012 #1
    1. The problem statement, all variables and given/known data

    Two coplanar lines l1 and l2 are perpendicular to each other, l1 passes through the points (-3,2,3) and (-8,10,6). Find the equation for l2 if it passes through the point (7,49,25)

    2. Relevant equations

    3. The attempt at a solution
    determine the equation of l1 and use the dot or cross product?
  2. jcsd
  3. Mar 17, 2012 #2


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    Science Advisor

    What you have under "The attempt at a solution" is NOT an attempt at a solution! If you think you neeed to find the equation of the line l1, the find it! What is the equation of that line? What must the equation of any line through (7, 49, 25) look like?
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