algebra 1

How do you determine if a mapping, table, or set of ordered pairs represents a function?

A-all x values are different

B-some x values repeat

C-some y values repeat

D-all y values are different

I really have no clue what it is.

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  1. You can only have one value of y for each value of x
    if x values were to repeat, they would have to have the same y value, which would be kind of unnecessary and meaningless.

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  2. so would it be d?

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  3. No, a parabola, for example y = x^2 is a function. There is one and only one value of y for every x
    y s the same , +1 , for x = -1 and for x = +1

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  4. I think the x values should be different :)

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  5. Thank you sooo much!

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  6. you cannot have the same x value twice. For example,
    (2,3) and (2,4)
    How can f(2) be 4 , if f(2) = 3?

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    oobleck
  7. if you had x = 0, y = 5
    and also
    x = 0, y = 7
    that would NOT be a function

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