Which set of ordered pairs represents a function? { (2, - 2), (1, 5), (-2, 2), (1, - 3), (8, - 1) } { (3, - 1), (7, 1), (-6, - 1), (9, 1), (2, - 1) } { (6, 8), (5, 2), (-2, - 5), (1, - 3), (-2, 9) } { (-3, 1), (6, 3), (-3, 2), (-3, - 3), (1, - 1) }

If you mean one-to-one function then

for every input, you get one output

(x, y)

x=input

y=output

basically, x never repeats witha differnt y

look at them

1st one

not since we have (1,5) and (1,-3) the 1 repeats with 2 y's

2nd one

yes, no repeats

3rd one

not since (-2,-5) and (-2,9), - 2 repeats with - 5 and 9

4th one

not since we have (-3,1) (-3,2), (-3,-3) - 3 repeats with 1,2,-3

answer is 2nd one or

{ (3,-1), (7,1), (-6,-1), (9,1), (2,-1) }