Which relation is a function of x?

table 1:
-1,7
2,-9
2,8
3,-4

table 2:
-8,-9
-8,2
1,-9
1,2

table 3:
-5,1
-5,7
-5,-9
-5,2

table 4:
-3,-1
-2,5
4,0
7,-1

table 4

Step-by-step explanation:

for it to be a function it has to have different domains, so you just have to find the table with different first numbers.

step-by-step explanation:

the true ones are a b and d

at least two

step-by-step explanation: