Which statement about horizontal lines is true?

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Multiple Choice

Which statement about horizontal lines is true?

Explanation:
Slope is rise over run, Δy/Δx, with Δx not zero. A horizontal line has no vertical change as you move along it, so Δy = 0. Therefore the slope is 0/Δx = 0. This means the line is level and has neither a positive nor a negative slope. The slope would be undefined only for vertical lines (where Δx = 0), not horizontal ones.

Slope is rise over run, Δy/Δx, with Δx not zero. A horizontal line has no vertical change as you move along it, so Δy = 0. Therefore the slope is 0/Δx = 0. This means the line is level and has neither a positive nor a negative slope. The slope would be undefined only for vertical lines (where Δx = 0), not horizontal ones.

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