The equation \( y = -3 \) represents a horizontal line where the value of \( y \) is always -3, regardless of the value of \( x \).
In the context of functions, for an equation to be a function, each input (or \( x \)-value) must correspond to exactly one output (or \( y \)-value). In this case, every value of \( x \) gives a single output of -3, which meets the criteria for being a function.
Therefore, the statement is true.
Enter: 1.