Answer
$5 $ units
Work Step by Step
Given:
$ P_{1}(2, -3) \\P_{2}(5, 1)$
Use the Distance Formula between the two points $P_{1}\left(x_{1}, y_{1}\right) \text{ and }P_{2}\left(x_{2}, y_{2}\right)$
$d=\sqrt{\left(x_{2}-x_{1}\right)^{2}+\left(y_{2}-
y_{1}\right)^{2}}$ to obtain:
$d=\sqrt{(5-2)^{2}+(1-(-3))^{2}}$
$d=\sqrt{3^{2}+4^{2}}$
$d=\sqrt{9+16}$
$d=5 \quad \text{ units}$