Answer:
Data Set 1 and 3.
Explanation:
For a table to be a function, there cannot be multiple x values of the same number. This means that a function must be one-to-one.
When looking at the data sets, we can eliminate them by using this logic. Data Set 2 contains two y values at y = 6, as well as two x values at x = 1. Therefore, this is not a function.
Data Set 1 is the only table that represents a function because it consists of different x values without any repeating.
Data Set 3 also contains different x values without repetition. Each x value has a specific y value. This is a function as well.