Question

Which set of ordered pairs below is a function?

A {(3,–2); (5,–3); (7,–4); (9,–5)}

B {(3,–2); (3,–12); (9,–2); (12,–2)}

C {(4,–2); (5,–3); (7,–4); (7,–5)}

D{(4,–2); (4,–3); (4,–8); (4,–9)}

Answer 1

The answer is A.

Ordered pairs that equate to a function would not have two separate points with the same x-value. In other words, every x-value must be associated with only one y-value.