Question

Which of the sets of ordered pairs represents a function? A = {(3, −5), (4, 6), (−3, 9), (2, 7)} B = {(2, 4), (−1, −7), (5, 6), (4, 3)} Only A Only B Both A and B Neither A nor B

Answer 1

functions will not have repeating x values...they can have repeating y values, just not the x ones.
so both A and B are functions...because all the x values are different

Answer 2

Both. As long as the x inputs have different y outputs, it will always be a function.