Find the $2 \times 2$ matrix $\mathbf{M}$ such that $\mathbf{M} \begin{pmatrix} 2 \\ 7 \end{pmatrix} = \begin{pmatrix} -15 \\ -6 \end{pmatrix}$ and $\mathbf{M} \begin{pmatrix} 4 \\ -1 \end{pmatrix} = \begin{pmatrix} 15 \\ 18 \end{pmatrix}.$
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Find the $2 \times 2$ matrix $\mathbf{M}$ such that $\mathbf{M} \begin{pmatrix} 2 \\ 7 \end{pmatrix} = \begin{pmatrix} -15 \\ -6 \end{pmatrix}$ and $\mathbf{M} \begin{pmatrix} 4 \\ -1 \end{pmatrix} = \begin{pmatrix} 15 \\ 18 \end{pmatrix}.$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
\begin{pmatrix} 3 & -3 \\ 4 & -2 \end{pmatrix}
Find the $2 \times 2$ matrix $\mathbf{M}$ such that $\mathbf{M} \begin{pmatrix} 2 \\ 7 \end{pmatrix} = \begin{pmatrix} -15 \\ -6 \end{pmatrix}$ and $\mathbf{M} \begin{pmatrix} 4 \\ -1 \end{pmatrix} = \begin{pmatrix} 15 \\ 18 \end{pmatrix}.$
train