Question

Which of the following expressions represents a function?
A.) y = x2
B.) {(9, 2), (4, −2), (5, 3), (9, −4)}
C.) x = −3
D.) x2 = 25 − y2 <--- I think

Answer 1

HI!!

Answer 2

and no!!

Answer 3

it does not represent a function because the \(y\) term is squared

Answer 4

which means one x can have two y's

Answer 5

B is not a function because the 9 repeats

Answer 6

C is not a function because it is a vertical line, which fails the vertical line test spectacularly

Answer 7

that leaves?

Answer 8

So that mean it's A, thank you so much!!!