We notice that the gradient of a curve changes at every point on the curve, therefore we need to work with the average gradient.

The average gradient between any two points on a curve is the gradient of the straight line passing through the two points.

In other words, average gradient is the same as the rate of change.

**Formula to calculate average gradient.**

**Example:**

Suppose you have a curve and your asked to find the average gradient of a point (0,2) , ( 5,4).

Therefore, the average gradient is 0.4.