Final answer:
The slope of the line is undefined in this case because the denominator is zero.
Step-by-step explanation:
The slope of a line can be found using the formula:
slope = (y2 - y1) / (x2 - x1)
In this case, the two points given are (-13, 16) and (-13, 12).
Using the formula, we can calculate the slope as:
slope = (12 - 16) / (-13 - (-13))
slope = -4 / 0
The slope of the line is undefined in this case because the denominator is zero.