Question

Which relation defined by a set of ordered pairs is a function?
{(2, 6), (3, 6), (4, 5), (6, 6), (7, 6)}
{(6, 2), (6, 3), (5, 4), (6, 6), (7, 6)}
{(2, 6), (3, 6), (4, 5), (6, 6), (6, 7)}
{(–2, 6), (3, –6), (–4, 5), (6, –6), (6, –7)}

Answer 1

The order pairs (2,6),(3,6)(4,5),(6,6),(7,6) form a function