Which of the sets of ordered pairs represents a function?

a = {(1, −5), (8, −5), (8, 7), (2, 9)}
b = {(7, −4), (7, −2), (6, −3), (−9, 5)}

only a
only b
both a and b
neither a nor b

The correct option is 4. Neither A nor B represents a function.

Step-by-step explanation:

The given sets of ordered pairs are

A set of ordered pairs represents a function if there exist unique outputs for all inputs. It means for each values of x there exist, a unique value of y.

In set A the value of y-coordinates are -5 and 7 at .

At x=8, there exist more than one value of y, so the set A is not a function.

In set B the value of y-coordinates are -4 and -2 at .

At x=7, there exist more than one value of y, so the set B is not a function.

Therefore neither A nor B represents a function and option 4 is correct.

step-by-step explanation: