The rate of change of any function is its derivative. The equation of a horizontal line is simply a constant, for example y=10. The derivative of any constant is ZERO.
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The slope of a line is defined as the rate of change on the vertical, or y axis, divided by the rate of change on the horizontal, or x axis.This is more commonly expressed as:Δy/ΔxFor example, a diagonal line that lies at a 45° angle relative to the horizontal axis will have a slope of 1/1 = 1.In the case of a horizontal line, it's rate of change on the y axis will be zero, this means that it's slope will be 0/Δx. Zero divided by anything equals zero, so that ends up being the slope of the line.
The length of the line.
A horizontal line on a phase change graph means there has been no change. Often longer periods of research are needed to see significant change.
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vertical change to the horizontal change between any two points on the line. study island.