The projection of $\begin{pmatrix} a \\ 7 \end{pmatrix}$ onto $\begin{pmatrix} -1 \\ 4 \end{pmatrix}$ is
\[\frac{26}{17} \begin{pmatrix} -1 \\ 4 \end{pmatrix}.\]Find $a.$
Question:
The projection of $\begin{pmatrix} a \\ 7 \end{pmatrix}$ onto $\begin{pmatrix} -1 \\ 4 \end{pmatrix}$ is
\[\frac{26}{17} \begin{pmatrix} -1 \\ 4 \end{pmatrix}.\]Find $a.$
Answer:
Let's think step by step.

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The projection of $\begin{pmatrix} a \\ 7 \end{pmatrix}$ onto $\begin{pmatrix} -1 \\ 4 \end{pmatrix}$ is
\[\frac{26}{17} \begin{pmatrix} -1 \\ 4 \end{pmatrix}.\]Find $a.$
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