SOLUTION: Does every straight line have a slope that is defined?

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Question 469936: Does every straight line have a slope that is defined?
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi

Does every straight line have a slope that is defined? NO

Vertical line, for example x = 3 has an undefined slope.

Using the point-slope formula, m+=%28y%5B2%5D+-+y%5B1%5D%29%2F%28x%5B2%5D+-+x%5B1%5D%29

As the x value does not change:  Slope is undefined.  CANNOT divide by zero.