Question

On a coordinate plane, solid circles appear at the following points: (negative 3, 2), (negative 3, 3), (1, 4), (1, negative 4), (2, negative 4), (2, negative 2).
How many points need to be removed from this graph so that it will be a function?

1 point
2 points
3 points
0 points

Answer 1

A relation is a function only if each x-value appears at most once. Here x = -3 has two points, x = 1 has two points, and x = 2 has two points. You must remove one point for each repeated x, so remove 3 points.