Question

What is an undefined slope

Answer 1

Answer: The slope of a line can be positive, negative, zero, or undefined. A horizontal line has slope zero since it does not rise vertically (i.e. y1 − y2 = 0), while a vertical line has undefined slope since it does not run horizontally (i.e. x1 − x2 = 0).

Explanation:

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Answer 2

A line has an undefined slope when it is a vertical line. A vertical line has no horizontal distance to it which is needed to have a positive, negative, or zero slope.