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Transform vectors using matrices

The transformation Ex\text E\,\vec{x} is defined by the following matrix.
E=[1221]\text E = \left[\begin{array}{rr}-1 & -2 \\ -2 & -1\end{array}\right]
Plot the result of Ev\text E\,\vec{v} for v=[20]\vec{v}=\left[\begin{array}{r}2 \\ 0\end{array}\right].
Created with RaphaëlCreated with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël