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**Table of Content**

Use this online average rate of change calculator that helps you to determine the average rate of a function on the given interval. Well, it is a rate that tells how a number changes on average with another. So, let’s dive in, to understand how to find average rate of change with a formula.

Generally, it defines how one quantity changes with the change in the other value. In other words, the average rate of change of a given function between input values is expressed as the total change of the output function divided by the change in input values.

The standard average rate of change equation is:

$$\frac {f(b)−f(a)} {b−a}$$

Where,

• (a, f(a)) are coordinates of the first point

• (b, f(b))are coordinates of other point.

If you know the intervals and a function, then, we apply the standard formula that calculates the average rate.

**Example:**

Find the average rate of change of function f(y) = 3y2 + 5 on the y interval (-1, 3).

**Solution:**

Where value of set a = -1 and b = 3 so that “a” is the left interval, and b is the right side on interval.

$$f(a) = 3(-12) + 5 = 8$$

$$f(b) = 3(32) + 5 = 32$$

Now, let’s substitute values into the average rate of change formula.

$$ \frac{(32 – 8)}{(3 – (-1))}$$

$$\frac{24}{4} = 6$$

• Firstly, enter a function for calculating the average rate.

• Now, plug in the values of the interval

• Press the calculate button

• Initially, the calculator displays the given function and interval.

• Then, provide the stepwise solution.

• Hence, you can do calculations numerous times by click on the “Recalculate” button.

From the source of Wikipedia: Slope Formula, Calculating Slope from a Graph, Slope Formula and Coordinates, Slope of Horizontal and Vertical Lines.

From the source of Brilliant: Average and Instantaneous Rate of Change, Instantaneous Rate of Change.