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Vector equation of planes

  1. Feb 25, 2010 #1
    1. The problem statement, all variables and given/known data
    I'm at (iii) of the question.
    attachment.php?attachmentid=23937&stc=1&d=1267121346.jpg

    2. Relevant equations



    3. The attempt at a solution
    I've got the different ans.
    [tex]
    \[
    Aug=
    \left( {\begin{array}{cccc}
    2 & -1 & 1 & 5 \\
    3 & 1 & -5 & 6 \\
    \end{array} } \right)
    \]
    [/tex]

    [tex]
    \[
    rref=
    \left( {\begin{array}{cccc}
    1 & 0 & \frac{4}{5} & \frac{11}{5} \\
    0 & 1 & \frac{-13}{5} & \frac{-3}{5} \\
    \end{array}} \right)
    \]
    [/tex]
     

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  2. jcsd
  3. Feb 25, 2010 #2

    LCKurtz

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Re: Vectors

    Hint: The cross product of the normals is in the direction of the line of intersection. (Why?)
     
  4. Feb 25, 2010 #3
    Re: Vectors

    i'm at part 3 . Thanks by the way. I've got my doubts cleared. (=
     
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