You can put this solution on YOUR website! for any and all x that you can think of in the real numbers.
You could put a bunch od points in your graph, and they would all have y=2, along with a variety of values for x.
Your line is horizontal. Yhe slope would be the difference in y between two points divided by the difference in x values. I could take point (0,2), with x=0 and y=2, and point (1,2), with x=1, and y=2.
I would calculate the slope as .