Which of the following relations is a function?

Select one:
a. {(0, 2), (1, 2), (2, 2), (3, 2)}
b. {(2, 0), (2, 1), (2, 2), (2, 3)}
c. {(4, 5), (6, 7), (8, 9), (8, 11)}
d. {(3, 5), (4, 7), (5, 9), (5, 11)}

Question

Which of the following relations is a function?

Select one:
a. {(0, 2), (1, 2), (2, 2), (3, 2)}
b. {(2, 0), (2, 1), (2, 2), (2, 3)}
c. {(4, 5), (6, 7), (8, 9), (8, 11)}
d. {(3, 5), (4, 7), (5, 9), (5, 11)}

psymon · Answer

A relation is a function if an x-value only has ONE corresponding y-value. So any of those options that show an x-value occuring twice is not a function. Each x must only have one y.

anonymous · Answer

Got it!!  Thank you!!