To find the value of $f(4)$ using the graph, follow these steps:

1. The function $f(x)$ is represented by the line on the graph.
2. Locate $x = 4$ on the horizontal (x) axis.
3. From $x = 4$, trace vertically until you reach the line representing the function.
4. From that point, trace horizontally to the y-axis to determine the corresponding value of $y$, which is $f(4)$.

By following the graph:

• At $x = 4$, the corresponding $y$-value (which is $f(4)$) appears to be -5.

Therefore, $f(4) = -5$.

Would you like more details or further questions? Here are 5 related questions to consider:

1. How do you determine the slope of a line from a graph?
2. What is the y-intercept of the function in this graph?
3. Can you write the equation of the line based on the graph?
4. What is $f(-2)$ based on the graph?
5. How do you find the x-intercept of a linear function from a graph?

Tip: The slope of a line is the ratio of the vertical change to the horizontal change between two points on the line.