Question

Which of the sets of ordered pairs represents a function? P = {(3, 5), (–1, 5), (04, –6), (2, 9)} Q = {(7, –2), (5, 9), (–1, 8), (5, –3)}

Answer 1

a function will not have repeating x values...they all have to be different x values...it doesn't matter if the y values repeat.

so  P has no repeating x values and is therefore a function