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# Let $\mathbf{v}$ and $\mathbf{w}$ be vectors such that \[\operatorname{proj}_{\bold{w}}( \bold{v} )= \begin{pmatrix} 4 \\ -7 \end{pmatrix}.\

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Let v and w be vectors such that $$\operatorname{proj}_{{w}}({v})= \begin{pmatrix} 4 \\ -7 \end{pmatrix}.$$
Find $$\operatorname{proj}_{-2{w}} (3{v})$$.

Oct 9, 2019