Question

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Answer 1

You don't want any x's repeated.

Answer 2

which two points have the same x?

Answer 3

yep those are the only two points in your set that have a common x

Answer 4

removing one or the other or even both would make your relation a function

Answer 5

So that was how I would find the answer? That was actually really easy, I'm kinda embarrassed, but thank you.

Answer 6

don't be and yes that is it