Answer
$\lt 3,-1 \gt$
Work Step by Step
Find vector for $ \vec {AB}$
$ \vec {AB}=\lt x_2-x_1,y_2-y_1 \gt$
$ \vec {AB}=\lt 2-(-1),2-3 \gt$
$ \vec {AB}=\lt 3,-1 \gt$
The equivalent representation, starting at the origin, is a vector from point $(0,0)$ to the point $\lt 3,-1 \gt$.