SOLUTION: Is there a difference between no slope and an undefined slope of a straight line? If so,then what is it?

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Question 468070: Is there a difference between no slope and an undefined slope of a straight line? If so,then what is it?
Found 2 solutions by nerdybill, ewatrrr:
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
"no slope" describes a horizontal line
whereaas
"undefined slope" describes a vertical line

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

 y = 2  Green Line has no slope, m = 0

 x = 2  Blue Line has an undefined slope, x has zero change

(slope = (change in y)/(change in x)CANNOT divide by zero, therfore it's undefined