Recovering an unknown vector

Recovering an unknown vector

Secondary 4
2 marks
TGM Original Questions

Given \(\mathbf{a}=\begin{pmatrix}-1\\ 3\end{pmatrix}\) and \(2\mathbf{a}+\mathbf{b}=\begin{pmatrix}5\\ -1\end{pmatrix}\), find \(\mathbf{b}\).[2]

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Answer:\(\begin{pmatrix}7\\ -7\end{pmatrix}\)

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