Answer:
The first table(top row, leftmost) represents a function
Explanation:
In a function y = f(x), the value for y must be unique for a value of x
In other words, you cannot have two different values of y for the same x
We see that only the first table(top row, leftmost) satisfies this requirement
So that is the answer
Second table has two values for x = -5
Third table has two values of x = -2
Fourth table has two values for x = -4