Answer and Step-by-step explanation:
Only the 4th table is a function.
The first table has two x values, which can't be a function, as functions only allow 1 x value for a y value. 2 or 3 y values that are the same are okay as long as each of their x-values are different from each other.
The fourth table (4) on the other hand has each x with its own y value.
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