To determine the value of $f(6)$, you would need to locate the point on the graph where $x = 6$. The corresponding $y$-coordinate of this point gives the value of $f(6)$.

If you have a graph available or can provide an equation, I can assist further. However, based on the problem statement alone, I cannot directly give you the answer without the graph or additional information. If you can upload the graph or provide more details, I'll be able to help you more effectively.

Do you have the graph, or would you like to describe it?

In the meantime, here are some questions related to graphing functions:

1. How can you identify the $y$-intercept of a function from its graph?
2. What does the slope of a function tell you about its behavior?
3. How do you find the zeroes (roots) of a function from its graph?
4. How would the graph change if the function was $f(x) + 2$ instead of $f(x)$?
5. How does the graph of a function shift if you replace $x$ with $x - 2$?

Tip: When reading graphs, pay attention to key points like intercepts, maximums, minimums, and the general shape of the curve to understand the function's behavior.