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Which of the following expressions represents a function?

A.{(1,2),(4,-2),(8,3),(9,-3)}
B.y^2=16-x^2
C.2x^2+y^2=5
D.x=7

Which of the following expressions represents a function? A.{(1,2),(4,-2),(8,3),(9,-3)} B-example-1

1 Answer

3 votes
Selection A is appropriate.

_____
The rest of the choices have one value of x corresponding to multiple values of y. Thus, they don't meet the requirement of a function.
User Yoonjesung
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