Question

Which relation is a function of x?

Answer 1

Table 4 I think
I hope it’s right xx

Answer 2

For a table to be a proper function, an x-value is only allowed to have one y-value. 

Table 1 has x = 2 have two y-values. Table 2 has x = -8, 1 have two y-values each. Table 3 has x = -5 have four y-values.

Table 4 can be a function of x.