To determine the slope of a line, we can analyze the changes in the y-coordinate as compared to the changes in the x-coordinate. Based on the values provided, it seems like there is a vertical line (since both y-coordinates are the same: 10 and -10 respectively).
Given these points:
- (x, -10)
- (x, 10)
Since the x-coordinates are the same (implying a vertical line), the slope would be considered undefined.
So the answer is: A. Undefined