If a line joining two points is vertical, the slope is:

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Multiple Choice

If a line joining two points is vertical, the slope is:

Explanation:
Slope is the ratio of vertical change to horizontal change, m = Δy/Δx. For a vertical line, any two points have the same x-coordinate, so Δx = 0. Dividing by zero isn’t defined, so the slope is undefined (sometimes described as an infinite slope). This is in contrast to a horizontal line, where Δy = 0 and the slope is 0. So a vertical line has an undefined slope.

Slope is the ratio of vertical change to horizontal change, m = Δy/Δx. For a vertical line, any two points have the same x-coordinate, so Δx = 0. Dividing by zero isn’t defined, so the slope is undefined (sometimes described as an infinite slope). This is in contrast to a horizontal line, where Δy = 0 and the slope is 0. So a vertical line has an undefined slope.

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