If $T: {\mathbb R}^2 \rightarrow {\mathbb R}^2$ is a linear transformation such that $$T\left(\left[\begin{array}{c} 1\cr 0 \end{array}\right]\right) = \left[\begin{array}{c} -6\cr -7 \end{array}\right], \ \ \ T\left(\left[\begin{array}{c} 0\cr 1 \end{array}\right]\right) = \left[\begin{array}{c} 2\cr 6 \end{array}\right],$$ then the standard matrix of $T$ is

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