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It's the gradient, or the steepness, of a linear function. It is represented by 'm' in the linear formula y=mx+b. To find the slope of a line, pick to points. The formula is (y2-y1)/(x2-x1). See the related link "Picture of a Linear Function for a picture of a linear function.
A linear function would be represented by a straight line graph, so if it's not a straight line, it's nonlinear
You could put the equation in slope-intercept form or in parent linear function or even make a table of values.
Temperature Radio Active decay interest % population % Projectile of a ball exponential decay or growth depreciation %
Your age is a linear function (of time).