T\left( b \right) = \left[ {\begin{array}{*{20}c}
 6 & 7 \\
 { - 4} & { - 4} \\
\end{array}} \right]\left[ {\begin{array}{*{20}c}
 0 \\
 1 \\
\end{array}} \right] = \left[ {\begin{array}{*{20}c}
 7 \\
 { - 4} \\
\end{array}} \right]