If a line has slope 0, what is the slope?

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Multiple Choice

If a line has slope 0, what is the slope?

Explanation:
Slope is the ratio of vertical change to horizontal change as you move along a line. If a line has slope zero, the vertical change is zero no matter how far you go horizontally. That means the line stays at the same height as x changes, so it’s a horizontal line described by y = c. In the slope formula m = Δy/Δx, Δy = 0 while Δx ≠ 0, giving m = 0. A vertical line, by contrast, has undefined slope because Δx would be zero. So the slope being zero precisely identifies a horizontal line.

Slope is the ratio of vertical change to horizontal change as you move along a line. If a line has slope zero, the vertical change is zero no matter how far you go horizontally. That means the line stays at the same height as x changes, so it’s a horizontal line described by y = c. In the slope formula m = Δy/Δx, Δy = 0 while Δx ≠ 0, giving m = 0. A vertical line, by contrast, has undefined slope because Δx would be zero. So the slope being zero precisely identifies a horizontal line.

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