SOLUTION: WHy does a horizontal line have a slope of 0 when a vertical line has an undefined slope?

Question 401621: WHy does a horizontal line have a slope of 0 when a vertical line has an undefined slope?
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
Any two points on a horizontal line have coordinates (a, b) and (c, b). The slope is then equal to , given a is not equal to b.
Any two points on a vertical line have coordinates (d, e) and (d, f) (assuming e not equal to f). The slope is then equal to = undefined, because division by 0 is impossible.
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