(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

http://img296.imageshack.us/img296/6584/93872041bz2.png [Broken]

2. Relevant equations

http://img208.imageshack.us/img208/2062/55585340nj2.png [Broken]

3. The attempt at a solution

I think the key to the solution is the matrix A being non-singular but I can't see how.

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# LU decomposition

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