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Explain why the slope of a vertical line is referred to as undefined

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A vertical line is a line that has a fixed X axis. Slope is a measure of changes on the X and Y axis. You can't measure the change in X and Y values if your X isn't changing at all.
User Dschniepp
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Answer: The run of a vertical line is zero, and you can’t divide it by Zero.

User Nrion
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