Vector equation of planes

1. Feb 25, 2010

icystrike

1. The problem statement, all variables and given/known data
I'm at (iii) of the question.

2. Relevant equations

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

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

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2. Feb 25, 2010

LCKurtz

Re: Vectors

Hint: The cross product of the normals is in the direction of the line of intersection. (Why?)

3. Feb 25, 2010

icystrike

Re: Vectors

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