Q: Why is the slope of a horizontal line zero?

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A horizontal line has a slope of zero. The equation of a horizontal line is y = a.

The slope of a horizontal line is zero.

The slope of a line is the tangent of the angle made by the line with the X-axis. Since for a horizontal line, this angle is 0 and tan(0) = zero, the slope of a horizontal line is zero.

No. The slope of a horizontal line is zero. The slope of a vertical line is undefined.

Yes, it is true; slope zero is no slope.

A horizontal line.

horizontal line

A horizontal line has a slope of zero. For a vertical line, the slope is not defined (change of y / change of x would result in a division by zero).A horizontal line has a slope of zero. For a vertical line, the slope is not defined (change of y / change of x would result in a division by zero).A horizontal line has a slope of zero. For a vertical line, the slope is not defined (change of y / change of x would result in a division by zero).A horizontal line has a slope of zero. For a vertical line, the slope is not defined (change of y / change of x would result in a division by zero).

A horizontal line.

Horizontal lines always have a slope of zero. (i.e completely flat, level surfaces have a slope of zero). However a line does not have to have a slope of zero in order to be a line.

A line with slope of zero is horizontal. A line with no slope is vertical because slope is undefined on a vertical line.

The parallel line would also have a slope of zero (both are horizontal lines).