The **gradient** of a line is its steepness.

You can find it by using the coordinates of two points.

If the first point has coordinates (x_{a}, y_{a}) and the second has coordinates (x_{b}, y_{b}), use the formula below to find the value of the gradient:

Let's have a look at an example.

Find the gradient of a line passing through (1, 3) and (4, 9).

The formula above means that we need to subtract y-coordinates of both points, subtract the x-coordinates and divide the former by the latter.

You can do this in stages or in one go using a calculator.

**In stages:**

9 - 3 = 6

4 - 1 = 3

6 ÷ 3 = 2

The gradient is 2.

**Using a calculator:**

This is what you need to put into your calculator:

The answer is 2.