Question

Which of the sets of ordered pairs represents a function?

Answer 1

The answer is:

D - Neither A nor B

-Neither of the ordered pairs shows a straight linear line, and thus, they're not a function.

Edit 3/4/19: D is not the correct answer! I took the test, and it was the only question I had gotten wrong. Neither this answer or the answer above is correct.

Answer 2

Answer:

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

Step-by-step explanation:

The given sets of ordered pairs are

$A=\{(1,-5), (8,-5), (8,7), (2,9)\}$

$B=\{(7,-4), (7,-2), (6,-3), (-9,5)\}$

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 $x=8$.

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 $x=7$.

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.