The gradient (or slope) of a line on a graph is calculated using the formula:

$\text{Gradient} = \frac{\text{Change in } y}{\text{Change in } x} = \frac{y_2 - y_1}{x_2 - x_1}$

From the graph you provided, the line passes through the points $(0, 4)$ and $(4, -4)$.

Let's calculate the gradient:

1. The change in $y$ ($\Delta y$) is $y_2 - y_1 = -4 - 4 = -8$.
2. The change in $x$ ($\Delta x$) is $x_2 - x_1 = 4 - 0 = 4$.

So the gradient is:

$\text{Gradient} = \frac{-8}{4} = -2$

The gradient of the line is $-2$.

Would you like more details or have any questions? Here are some related topics you might find helpful:

1. What is the significance of the gradient in real-world scenarios?
2. How do you interpret a negative gradient?
3. What are the different ways to find the equation of a line?
4. How do you calculate the gradient if the line is horizontal?
5. How can the gradient be used to determine the steepness of a line?
6. What is the relationship between the gradient and the angle of inclination of a line?
7. How does changing the points on the line affect the gradient?
8. How would you find the gradient of a curve at a specific point?

Tip: Remember that a negative gradient means the line is sloping downwards from left to right on the graph.