Independent variables are variables of a quantity that are not affected by any conditions.
Dependent variables are variables of a quantity that change if conditions relative to that variable changes.
For example, we generally we take x as independent variable by x variable and dependent variable by y variable.
To find the rate of change we get two values of independent variable (x's) and two values of dependent variables (y's) to get two coordinates in form of
(x,1,y1) and (x2,y2).
And we can find the rate of change by applying slope formula
[tex]m= \frac{y_2-y_1}{x_2-x_1}[/tex].
