Need to know how to find the average rate of change

SOLUTION: In the graph shown, we can acquire some points.
In the graph where x = 1, y = 5 and if x = 5, y = 3.
The rate of change between two points on a curve can be approximated by calculating the change between two points.
FORMULA:
[tex]\frac{y_2-y_1}{x_2-x_1_{}}_{}[/tex]Given: (1,5) and (5,3)
Let's substitute.
[tex]\begin{gathered} \frac{5-3}{1-5}\text{ = -}\frac{1}{2}\text{ = -0.5} \\ \end{gathered}[/tex]ANSWER: -0.5