The given relation represents a function. domain: $(-\infty, 1]$ range: $[-1, +\infty)$
Work Step by Step
The given graph includes the x-values that are less than or equal to 1. Thus, the domain is $(-\infty, 1]$. The given graph includes the y-values that are greater than or equal to $-1$ Thus, the range is $[-1, +\infty)$. Note the all possible vertical lines that will pass through the graph will do so at exactly one point. The graph passes the vertical line test; therefore, the given relation represents a function.