Question

Which relation describes a function?
Responses
A {(0, 0), (0, 2), (2, 0), (2, 2)}
{(0, 0), (0, 2), (2, 0), (2, 2)}
B {(−2, −3), (−3, −2), (2, 3), (3, 2)}{(−2, −3), (−3, −2), (2, 3), (3, 2)}
C {(2, −1), (2, 1), (3, −1), (3, 1)}
{(2, −1), (2, 1), (3, −1), (3, 1)}
D {(2, 2), (2, 3), (3, 2), (3, 3)}{(2, 2), (2, 3), (3, 2), (3, 3)}
E {(4, 3) , (1, 8) , (4, 14) , (9, 16)}

Answer 1

B

Only B is a function because each input value (-2, -3, 2, 3) appears exactly once. All other choices have at least one input paired with more than one output.