What is the slope of the line through (-5, - 3) and (-5, - 7) ?

The answer is undefined.

Step-by-step explanation:

Slope is found using this equation: y-y1/x-x1. Fill in the coordinates to this equation. It should now look like this. - 7--3/-5--5. When subtracting from two negatives, it changes into a positive. For example, - 7--3 becomes - 7+3, which equals - 4. The same thing applies for the second part. - 5--5 becomes - 5+5, which equals 0. So, your slope is - 4/0. However, when a 0 is in the denominator, it becomes undefined. So, the answer is undefined.