SOLUTION: Jill would like to know why two line with an undefined slope are parallel. How would you respond?

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Question 1003517: Jill would like to know why two line with an undefined slope are parallel. How would you respond?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
All lines with undefined slope are vertical lines.
All vertical lines are parallel.