Hello!
The domain is the set of all possible x-values which will make the function true, and will output real y-values.
There are 5 points graphed. (0, 0), (1, 4), (2, 1), (3, 3), and (4, 1). Ordered pairs are written as (x, y), and the x-values are the domain of this graph.
Therefore, the domain of this function is 0 ≤ x ≤ 4, [0, 4], and {x | 0 ≤ x ≤ 4}. These are just several ways to write the domain.
