If a line has slope m = 0, what is its orientation?

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Multiple Choice

If a line has slope m = 0, what is its orientation?

Explanation:
A line’s slope tells how it rises or falls as you move to the right. If the slope is zero, there is no rise—the line stays at the same height as you go along—so it runs flat from left to right. That is horizontal orientation. (A vertical line has an undefined slope and goes straight up and down, while a diagonal line has a nonzero slope.) So a line with slope zero is oriented horizontally.

A line’s slope tells how it rises or falls as you move to the right. If the slope is zero, there is no rise—the line stays at the same height as you go along—so it runs flat from left to right. That is horizontal orientation. (A vertical line has an undefined slope and goes straight up and down, while a diagonal line has a nonzero slope.) So a line with slope zero is oriented horizontally.

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