Question

x | f(x)
2 | 5
7 | 43
4 | 21
0 | -14
6 | -17
function? ______

Explanation:

A relation is a function if every input (x-value) has exactly one unique output (f(x)-value). Checking the table, each x-value (2, 7, -4, 0, 6) appears only once, with no repeated x-values paired with different f(x)-values.

Answer:

Yes