Question

10 Which relation is a function?

y =
X
-1
0
1
1
2
3
(1)
y
1
0
1
2
4
9
(x,-1 (x², 2 (2)
y
(3)
{(0,1), (2,3), (3,2), (3,4)}
(4)

Answer 1

I think the answer is 3.