Now solved: In 120, use either Gaussian elimination or GaussJordan elimination to solve
Chapter 8, Problem 14(choose chapter or problem)
In Problems 13 and 14, find the entries \(c_23\) and \(c_12\) for the matrix C = 2A - 3B.
\(\mathbf{A}=\left(\begin{array}{rrr} 1 & -1 & 1 \\ 2 & 2 & 1 \\ 0 & -4 & 1 \end{array}\right), \quad \mathbf{B}=\left(\begin{array}{lll} 2 & 0 & 5 \\ 0 & 4 & 0 \\ 3 & 0 & 7 \end{array}\right)\)
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