Answer is {(1, 1), (1, 2), (1, 3), (1,4)}
The third choice
Step by step
{(1, 1), (1, 2), (1, 3), (1,4)} does not satisfy the requirements of a function because it has multiple x values of 1.
A function must have unique x values to pass the vertical line test. See attached picture showing the vertical line test.
These satisfy the requirements of a function.
O {(1, 1), (2, 2), (3, 3), (4,4)}
O {(1,4), (2,4), (3, 4), (4,4)}
O {(1, 2), (2, 3), (3, 4), (4,1)}
