Find the projection of $\mathbf{a}$ onto $\mathbf{b} = \begin{pmatrix} 1 \\ -3 \end{pmatrix}$ if $\mathbf{a} \cdot \mathbf{b} = 2.$
Question:
Find the projection of $\mathbf{a}$ onto $\mathbf{b} = \begin{pmatrix} 1 \\ -3 \end{pmatrix}$ if $\mathbf{a} \cdot \mathbf{b} = 2.$
Answer:
Let's think step by step.

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\begin{pmatrix} 1/5 \\ -3/5 \end{pmatrix}
Find the projection of $\mathbf{a}$ onto $\mathbf{b} = \begin{pmatrix} 1 \\ -3 \end{pmatrix}$ if $\mathbf{a} \cdot \mathbf{b} = 2.$
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