Refer to the relation below to answer the following questions.
\[
\{(7,8),(9,9),(-5,-5),(-4,4)\}
\]
a. Find the domain and range of the relation.
The domain of the relation is $\{7,9,-5,-4\}$
The range of the relation is $\{8,9,-5,4\}$.
(Use a comma to separate answers as needed)
b. Determine the maximum and minimum of the $x$-values and of the $y$-values.
The maximum $x$-value is the minimum $x$-value is
The maximum $y$-value is the minimum $y$-value is

Step 1 ：The given relation is \(\{(7,8),(9,9),(-5,-5),(-4,4)\}\).

Step 2 ：The domain of a relation is the set of all first elements (x-values) in the ordered pairs, and the range is the set of all second elements (y-values).

Step 3 ：The domain of the relation is \(\{7,9,-5,-4\}\).

Step 4 ：The range of the relation is \(\{8,9,-5,4\}\).

Step 5 ：To find the maximum and minimum of the x-values and y-values, we need to find the highest and lowest values in the domain and range, respectively.

Step 6 ：The maximum x-value is \(9\), the minimum x-value is \(-5\).

Step 7 ：The maximum y-value is \(9\), the minimum y-value is \(-5\).

Step 8 ：Final Answer: The maximum x-value is \(\boxed{9}\), the minimum x-value is \(\boxed{-5}\), the maximum y-value is \(\boxed{9}\), and the minimum y-value is \(\boxed{-5}\).