Question

On a coordinate plane, solid circles appear at the following points: (negative 2, negative 5), (negative 1, 3), (1, negative 2), (3, 0), (4, negative 2), (4, 4).

Which explains why the graph is not a function?

Answer 1

The input value of 4 results in two outputs - 4 and -2. Since the same input results on more than one output, the relation cannot be a function.