slope
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The constant rate of change between two points on a line is called slope.
the steepness of the line is the slope of the line which is the rate of change; the steeper the slope, the faster the rate of change
The rate of change on that line. This is called the tangent and is used in the application of the derivative.
If the graph is a non-vertical straight line, then the rate of change is constant. If the line is curved, then the rate of change (slope) varies.