Question

1.
(04.01)

Which of the sets of ordered pairs represents a function? (4 points)

A = {(−5, 5), (−2, 2), (2, −2), (5, −5)}
B = {(4, 2), (3, −2), (9, 4), (11, −3)}

Only A
Only B
Both A and B
Neither A nor B

Answer 1

if a relation is a function, no x-value may be used twice.
So look at A and B and check to see whether any x value is repeated. If not, then it is a function.

Answer 2

Only B