The function $f$ is defined by the set of ordered pairs:

$f = \{(6, -9), (-5, 6), (8, -8)\}.$

To find $f(6)$, you need to locate the pair where the first value (input) is 6. In this case, the pair is $(6, -9)$. The output value (second number) of this pair is $-9$.

Therefore,

$f(6) = -9.$

Would you like a detailed explanation, or do you have any questions?

Related Questions:

1. What is the range of the function $f$?
2. How do you determine if a relation is a function?
3. What is $f(-5)$ based on the given set of pairs?
4. Can a function have the same input with different outputs?
5. How do you find the domain of a function?

Tip:

When evaluating functions defined by ordered pairs, always look for the input value in the first component of the pairs.