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)}

Question

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)}

anonymous · Answer

Plot the points you have.

mertsj · Answer

A function is a set of ordered pairs in which no two ordered pairs have the same first number.

anonymous · Answer

Your answer is, {(3, 5), (-1, 7), (3, 9)}.
She's doing an Online class, but if you want to know how to solve the problem.
Graph the points.

mertsj · Answer

@xjakester That is NOT the answer.  (3,5) and (3,9) have the same first number.

anonymous · Answer

I completely missed that, it's {(1, 2), (3, 2), (5, 7)}

mertsj · Answer

Anyway why are you posting answers?  I explained how to do it.  You should let the asker do the problem.