Variable Rate of Change
The meaning of a variable rate of change of a function can be seen when the variables change in fixed proportions and the change unevenly.
A variable rate of change is represented by a line that is not straight, as seen in the following diagram:
![B3 - Function with inconsistent rate of change](/_ipx/f_png,s_500x303/https://cdn.tutorela.com/images/B3_-_Function_with_inconsistent_rate_of_change.width-500.png)