The domain of a set of points refers to the collection of all possible input values (x-values) from each point.

Given the set of points $\{(-2, 5), (4, 9), (1, -4), (0, 5), (2, -7)\}$, the domain consists of all the x-values:

$\{-2, 4, 1, 0, 2\}$

This is the domain of the relation.

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Here are 5 related questions for further exploration:

1. What is the range of this set of points?
2. How do you determine the domain of a function from its equation?
3. Can a domain include repeated x-values in a function?
4. What is the difference between domain and range?
5. How do you find the domain of more complex functions like square roots or rational functions?

Tip: For a function to be valid, each x-value (input) should have exactly one y-value (output). Repeated x-values can imply the relation is not a function!