Question

Which set of ordered pairs does not represent a function?

{(-2,5), (-7,4), (9,3), (0,5)}
{(8, -8), (4, -6), (-2,8), (8,4)} {(0,5), (3, 2), (5,-6), (-5, -6)} {(3,-2), (-2,-7), (7,-9),(-1,5)}

Answer 1

9514 1404 393

Answer:

b. {(8, -8), (4, -6), (-2,8), (8,4)}

Explanation:

The x-values in each list are ...

a. -2, -7, 9, 0 . . . . all unique; is a function

b. 8, 4, -2, 8 . . . . 8 is repeated; not a function

c. 0, 3, 5, -5 . . . . all unique; is a function

d. 3, -2, 7, -1 . . . . all unique; is a function

When a relation has same input values giving different output values (x-values are repeated in the list), then the relation is not a function.