Answer
undefined; the line is vertical
Work Step by Step
Simply apply the points to the slope formula and then simplify. Since the answer is undefined, the line is vertical.
$(3,-4)$ and $(3,5)$
$\frac{y_2-y_1}{x_2-x_1}$
$\frac{5+4}{3-3}$
$\frac{9}{0}$
undefined