Assistance with functions please

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I know this is basically saying y(x) =
So say we take a coordinate used for the table of values from II if y(x) does that mean if we plug in 1 for y and then solve the problem should we get the same coordinate ? I am confused how to represent this

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It's asking you which of the three are functions. You don't actually have to plug anything in.
Well i was just giving an example if the equation was there
Functions will pass the vertical line test when they're graphed and never have the same input listed twice when given a list of points. So that's how you'd evaluate them
so with that being said then, so 3 would be alright then? Since no inputs are repeating?
yes
inputs also don't repeat for II
Yes just saw that as well so then to test I you would just fill in your own table of values and test and then graph to test?
yes you can do that
actually. Since its a quadratic function it would be alright as well then?
correct
Whoop, Thank you much for explaining!
you're welcome

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