Question

Which relation is a function?

I. {(2, 4), (–1, 7), (3, 0), (5, 4)}
II. {(–3, 6), (–3, 6), (8, 6), (8, 10)}
III. {(4, 1), (–2, 5), (–8, 3), (4, 6)}

A. II only

B. I only

C. I and II

D. II and III

Answer 1

It is B. There is one value of x in (2, 4), (–1, 7), (3, 0), (5, 4).