The difference in the X-coordinates (in the X-axis (horiztontal(left-right))) of two points is called the "run".
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The difference in x-coordinates is called the "run", and the difference in y-coordinates is the "rise".
Calculate the slope as (difference of y-coordinates) / (difference of x-coordinates).
Calculate the difference of the y-coordinates, and divide it by the difference of the x-coordinates. That is the slope.
The distance between two points is Square root of [ (difference in their 'x' coordinates)2 + (difference in their 'y' coordinates)2 ]
There is no difference in the y-coordinates so the distance is simply in the x-coordinates and that is |-4 -4| = |-8| = 8