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Good question. They have infinite slopes.

Incidentally, vertical lines are not functions in the formal sense. One x value is mapped on to an infinite number of y values. A function requires that each x maps on to only one y value.

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15y ago

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The slope of a vertical line is undefined. This is because the slope is the rise divided by the run and a vertical line has a run of 0. Since we cannot divide by zero, the slope is undefined.

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9y ago
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Q: What is the slope of a vertical line?
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