Answer:
Zero Slope
Step-by-step explanation:
A Negative Slope is going down on the graph and it is negative M (y=mx+b)
A Positive Slope has is going up on the Graph and it is a positive M (y=mx+b)
(Imagine a Mountain)
Zero Slope is where there is only one y value and infinite x values
Undefined is where there is one x value and infinite y values
