Question

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Which relation is a function?
О А.
B.
D.
xy
4-2
5-3
6-2
7 -3
ху
3 10
2 20
3 30
4 40
xy
-5 2
-5 3
-10 4
-10 5
X У
10 15

Answer 1

Key function concepts

answer

B&D

steps

A. This relation contains the ordered pair (4,2) twice, so it is not a function.

B. This relation passes the vertical line test, so it is a function.

C. This relation contains the ordered pair (-5,2) and (-5,3), so it is not a function.

D. This relation passes the vertical line test, so it is a function.

Therefore, the relations that are functions are B and D.

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