The gradient (slope) of the curve at the midpoint at which the changes are calculated or the derivative of the curve at that point. These are only crude approximations unless the function is linear or if the changes are taken over very very small intervals. Equivalently, it is the slope of the tangent to the curve.
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the change in y over the change in x equals the slope(m) in the equation y=mx+b
slope is change in y over change in x
yes, change in y over change in x equals slope
The slope of a function is the y-intercept or the change in y, over the change in x.
rise over run or change in y over change in x