The transformation $\text E\,\vec{x}$ is defined by the following matrix.
$\text E = \left[\begin{array}{rr}2 & 0 \\ -2 & 0\end{array}\right]$
**Plot the result of $\text E\,\vec{v}$ for $\vec{v}=\left[\begin{array}{r}-1 \\ 1\end{array}\right]$.**
[[☃ interactive-graph 1]]