Let $\vec{x}=\left[\begin{array}{c} -4\cr 1 \end{array}\right]$ and $\vec{y}=\left[\begin{array}{c} -4\cr 4 \end{array}\right]$. Find the vector $\vec{v}=7 \vec{x} - 4 \vec{y}$ and its additive inverse.

$\vec{v} =$ $\left[\Rule{0pt}{2.4em}{0pt}\right.$$\left]\Rule{0pt}{2.4em}{0pt}\right.$
$-\vec{v} =$ $\left[\Rule{0pt}{2.4em}{0pt}\right.$$\left]\Rule{0pt}{2.4em}{0pt}\right.$