Question

Which set of values is a function? *
{(9,5) (10,5) (9,-5) (10,-5)}
{(3,4) (4,-3) (7,4) (3, 8)}
{(6,-5) (7, -3) (8, -1) (9, 1)}
{(2, -2) (5, 9) (5, -7) (1, 4)}​

Answer 1

Answer:

{(6,-5) (7,-3) (8-1) (9,1)}