-2
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It is simply the difference between their y coordinates.
Horizontal
midpoint: (8, 5)
-- The 'x' coordinate of the midpoint is the average of the 'x'-coordinates of the end-points. -- The 'y' coordinate of the midpoint is the average of the 'y'-coordinates of the end-points.
The distance between (x, y1) and (x, y2) is abs(y1 - y2) or |y1 - y2|.