# How do you find the determinant of ((-4,-1), (0, -1))?

$| \left(- 4 , - 1\right) , \left(0 , - 1\right) | = 4$
$\det \left(\begin{matrix}- 4 & - 1 \\ 0 & - 1\end{matrix}\right) = | \left(- 4 , - 1\right) , \left(0 , - 1\right) |$
$\text{ } = \left(- 4\right) \left(- 1\right) - \left(0\right) \left(- 1\right)$
$\text{ } = 4 - 0$
$\text{ } = 4$