SOLUTION: is lines slope undefined when the 0 is on top of the fraction or the bottom of the fraction

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Question 178862: is lines slope undefined when the 0 is on top of the fraction or the bottom of the fraction
Answer by EMStelley(208) About Me  (Show Source):
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When the 0 is on the "top" of the fraction, that would mean that the two y-values are the same. Thus that line is horizontal (slope of 0). If the "bottom" of the fraction is 0 that means the two x-values are the same. Thus that line is vertical (undefined slope).