You can put this solution on YOUR website!
Both points involve the same y coordinate (0)
This means the two points are on the same horizontal level. They are both on the horizontal x axis.
Horizontal lines always have a slope of 0.
slope = rise/run
In this case the rise is 0 to indicate we don't go up or down. There's no change in the y value.
If you wanted to involve the slope formula, then this is one way to do so
(x1,y1) = (2,0) and (x2,y2) = (14,0)