How do you find the point-slope form of the equation of the line passing through the point (-1, -3) and has slope 5?

$y = a x + b$
$y = a x + b \implies - 3 = - a + b$;
a is the slope of the equation, we found that as $5$;
$- 3 = \left(5 \cdot - 1\right) + b \implies - 3 = - 5 + b \implies b = 2$;
$y = a x + b \implies \underline{y = 5 x + 2}$