Question

Which ordered pair
(
x
,
y
)
makes this relation a function?



{
(
2
,
1
)
,
(
1
,
2
)
,
(
0
,
−
2
)
,
(
−
2
,
0
)
,
(
3
,
3
)
}




(
−
3
,
8
)


(
−
2
,
7
)


(
0
,
7
)


(
1
,
8
)

Answer 1

(-3, 8)

A relation is a function if each x-value appears only once. The x-values already present are 2, 1, 0, −2, and 3; only −3 is new, so (−3, 8) keeps it a function.