Let $\mathbf a = \langle 2, 3 \rangle$ and $\mathbf b = \langle 1, -2 \rangle$. Show that there are scalars s and t so that $s \mathbf a + t \mathbf b = \langle 1, -9 \rangle$
You might want to sketch the vectors to get some intuition.

$s =$
$t =$