To find the value of $f(4)$ from the graph of $y = f(x)$, we need to locate the point on the graph where $x = 4$ and determine the corresponding $y$-value.

1. On the $x$-axis, go to $x = 4$.
2. From $x = 4$, move vertically until you reach the curve.
3. At $x = 4$, the graph intersects at $y = 5$.

Therefore, $f(4) = 5$.

Would you like more details or have any questions?

Here are some related questions:

1. How can you determine other values of $f(x)$ from this graph?
2. What does the maximum point on this graph represent for $f(x)$?
3. How would you find $f(2)$ using the graph?
4. What can be inferred about the symmetry of the graph of $f(x)$?
5. How would you determine if $f(x)$ is increasing or decreasing on certain intervals?

Tip: When evaluating a function from a graph, always locate the given $x$-value on the horizontal axis and then find where it intersects with the curve to identify the $y$-value.