The slope of a line is the rise (Vertical distance) over the run (Horizontal distance). To find the slope of the line between two points, you can use the slope formula:
slope = rise / run
For the line through the points (8,2) and (10,2), the rise between the two points is 2 - 2 = 0 and the run is 8 - 10 = -2 because the second point is below the first.
So the slope of the line between (8,2) and (10,2) is 0 / -2 which simplifies to 0.
So the slope of the line is 0.