How can the variable rate of change of a function be identified?

For example, if the constant interval of the $X$ is $2$ and that of the $Y$ is not constant and varies from time to time. An inconsistent interval could be: $1,3,7,13$ If the function is not represented with a straight graph, it means that the rate of change is not constant. Each part of the function will have a different rate of change, a different slope.

Graph of the Variable Rate of Change

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Question 1

Given the following graph, determine whether the rate of change is uniform or not