Answer:
D
Explanation:
The slope of a line represents the number of units a line rises or falls vertically for each unit of horizontal change from left to right.
1) A line with positive slope (m > 0) rises from left to right.
2) A line with negative slope (m < 0) falls from left to right.
3) A line with zero slope is horizontal (parallel to x-axis).
4) A line with undefined slope is vertical (parallel to y-axis).
Ans: The line is parallel to y-axis. So, the slope is undefined