Question

Which of the following relations is NOT a function?

{(1,5), (3, -1), (7,9)}
{(5, 1), (6,4), (5, 2)}
{(1,5), (2,5), (4,5)}
{(1, 1), (2, 2), (3, 3)}​

Answer 1

Answer: The answer is b. (5, 1), (6,4), (5, 2)}

Explanation: You can only have one input for every output. Here we see that there are two inputs here for two diffrent equations. Two 5's. : )