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Math 2418 Linear Algebra Quiz \#2


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[10] ~1.)  Prove that matrix multiplication for SQUARE matrices is not 
commutative  (I.e.,  give two specific square matrices with real numbers 
and 
show with these matrices $AB \not= BA$).  


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[10]~ 2.)  Given the following augmented matrix, solve

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\centerline{$\left[\matrix{ 
1 & 0 & 0 & 0 & 0 & 8 \cr
0 & 1 & 2 & 0 & 1 & -5  \cr
0 & 0 & 0 & 1 & -3 & 4  \cr }\right]$}




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