- Choice A\begin{align*} \begin{bmatrix} 9&8\\ -4&7\\ \end{bmatrix}+ \begin{bmatrix} -6&6\\ 5&4\\ \end{bmatrix}= \begin{bmatrix} 9-6&8+6\\ -4+5&7+4\\ \end{bmatrix}= \begin{bmatrix} 3&14\\ 1&11\\ \end{bmatrix} \end{align*}
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