Question

Which set of ordered pairs represents a function? *

O {(1,8), (8, 1), (1,5), (5, 1)}
O {(2,1),(3,1),(4,3), (5,3)}
O {(5,1),(3, 8), (3,7), (7.1);
{(5,1),(5,6), (1,3), (9.7)}

Answer 1

the second one because the x values should not have repeating numbers

Answer 2

The answer is the second choice.

There cannot be repetitive domains in one set. Therefore, all choices except the second choice have repetitive domains.

Thus, not making them a function but rather a relation instead for other choices. The only relation that is a function here is the second choice.