Question

Choose the relation with a domain of {-4, -2, 0, 1, 3}.

A R = {(3, 1), (0, 0), (-2, -4)}
B R = {(3, 2), (1, 8), (1, 2), (0, -5), (-4, 4), (-2, 5)}
C R = {(2, 3), (8, 1), (2, 1), (-5, 0), (4, -4), (5, -2)}
D R = {(-4, -2), (0, 0), (1, 3)}

Answer 1

Choices A and D are out because the domain has 5 elements, but there are only 3 ordered pairs in A and D.


Choice C is out because it has the ordered pair (2, 3) which has 2 in the domain, but it's not in the set {-4, -2, 0, 1, 3}


So by process of elimination, the answer is choice B

Answer 2

and sure enough, choice B has ordered pairs in which every x value is represented in the original set {-4, -2, 0, 1, 3}