Which of the following sets represents a function?

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

Choice A is not a function because x = 3 repeats itself. We have x = 3 leading to more than one y value.

The same applies for choice C. The x value x = 1 repeats itself.

The only case where this doesn't happen is with choice B. The unique x values indicate we have a function. For any given x, there is EXACTLY ONE output.



Choice B

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.