\begin{pmatrix} 1 & -3 & -1 & -1 \ -1 & 0 & -2 & -1 \ 0 & 1 & 1 & 1 \end{pmatrix} \begin{pmatrix} b1 \ b2 \ b3 \ b4 \end{pmatrix} = ?
Added by Kenneth J.
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The result will be a $3 \times 1$ matrix. Show more…
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