The figure below shows four named points $A$, $B$, $C$, and $D$ on a grid generated by two vectors $\mathbf{v}_1$, $\mathbf{v}_2$ in $\mathbb{R}^2$.

### Part 1

Write each point as a sum of scalar multiples of $\mathbf{v}_1$ and $\mathbf{v}_2$. Enter v1 for $\mathbf{v}_1$ and v2 for $\mathbf{v}_2$.
$A=$
$B=$
$C=$
$D=$

### Part 2

Write each vector as a sum of scalar multiples of $\mathbf{v}_1$ and $\mathbf{v}_2$. Enter v1 for $\mathbf{v}_1$ and v2 for $\mathbf{v}_2$.
$\overrightarrow{AB} =$
$\overrightarrow{BA} - \overrightarrow{CA} =$
$C + 9 \mathbf{v}_2 =$
$D + 9 \overrightarrow{DA} =$