Now solved: In 120, use either Gaussian elimination or GaussJordan elimination to solve
Chapter 8, Problem 15(choose chapter or problem)
If \(\mathbf{A}=\left(\begin{array}{rr} 4 & 5 \\ -6 & 9 \end{array}\right) \text { and } \mathbf{B}=\left(\begin{array}{rr} -2 & 6 \\ 8 & -10 \end{array}\right)\), find (a) A + B, (b) B - A, (c) 2A + 3B.
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