Which set of points represents a function? a. (-5, -4), (-4,-3), (-3, -2), (-2, -1) b. (-6,2), (6,-2), (-5, 3), (-5,-3) c. (8, -1), (8,2), (8,-3), (8,4) d. (1,3), (-4,4), (3,-2), (1,0) can someone tell me how they got the answer?

For a set of ordered pairs, a function will have no x-repeats, namely, the x-coordinate in the pairs, do not repeat, they're unique.

now if the set has one x-repeat, then is NOT a function, let's check these ones,





so, the ones with a repeated x-value, are not functions.

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