The function given is:

$f(x) = 5 + x$

To find $f(9)$, we substitute $x = 9$ into the function:

$f(9) = 5 + 9 = 14$

Thus, $f(9) = 14$.

Would you like more details or have any questions?

Here are 5 related questions you might find interesting:

1. What happens to the value of $f(x)$ as $x$ increases?
2. How would you find $f(x)$ for other values, like $f(20)$?
3. What is the inverse function of $f(x) = 5 + x$?
4. How would you graph this function $f(x) = 5 + x$?
5. What is the slope and y-intercept of this linear function?

Tip: When working with linear functions, always check if you can recognize its slope and intercept to understand how it behaves graphically.