Solution: If a matrix A is premultiplied by an elementary matrix E, the product EA will
Chapter 8, Problem 42(choose chapter or problem)
Write the system of equations
\(\begin{aligned} 2 x_{1}+6 x_{2}+x_{3} &=7 \\ x_{1}+2 x_{2}-x_{3} &=-1 \\ 5 x_{1}+7 x_{2}-4 x_{3} &=9 \end{aligned}\)
as a matrix equation AX = B, where X and B are column vectors.
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