Question

Identify the relation that is also a function.

{(0, -1) (1, -2) (2, -3) (-1, 2)}

{(1, 0) (2, 3) (3, -1) (1, 5)}

{(4, 2) (4, -3) (9, 3) (9, -3)}

{(5, 4) (5, 1) (5, 3) (0, 5)}

Help pls

Answer 1

same as before http://openstudy.com/updates/53ab4534e4b0a819ab12f5e5

check for X-REPEATS
if it has X-REPEATS, is not a function

if it doesn't have X-REPEATS, it is