Question

4. Which of the following relations is NOT a function?

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

Answer 1

O {(2, 1), (4, 3), (6,5), (2, 7)}

Explanation:

The rule for a function is that you can't have multiple outputs for the same input, or you can't have multiple y for a single x