0. There is no x in your equation so regardless of how you change your input, the output y never changes.
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The rate of change of a function is found by taking the derivative of the function. The equation for the derivative gives the rate of change at any point. This method is used frequently in calculus.
The rate of change for the linear (not liner) function, y = 2x +/- 3 is 2.
rate of change
There is a change in population.
Negative means people are leaving. Zero means that people are coming and going in equal amounts.