Calculus Course/Rate of Change

Rate of Change
Rate of Change is used to describe the ratio of a change in one variable compare to a change of another variable

If there is a function $$f(x)=y$$ then the rate of change of the function $$f(x)$$ correspond to the rate of change of variable z is
 * $$\frac{\Delta y}{\Delta x}=\frac{\Delta f(x)}{\Delta x}$$

Example
If there are two points $$(1,3)$$ and $$(2,7)$$
 * $$\frac{\Delta y}{\Delta x}=\frac{\Delta f(x)}{\Delta x}=\frac{7-3}{2-1}=4$$