Can someone help me with this math problem?

Question

the problem says "Which of the following relations is a function?"
a. (3, -3) (4, -3) (2, -3)
b. (1, 7) (8, 4) (-3, -4) (1, 4)
c. (2, 0) (2, 3) (2, 8) (2, -3)
d. (1, -1) (0, 0) (1, 0) (0, -1)



if u can figure out please tell me how you got the answer..... thanks!!

Answer 1

If function describes a relationship between variables, then none of them is a function..

Answer 2

a.(3, -3) (4, -3) (2, -3)
This represent a point in space ( Three diamensional)