Question

Which of the following expressions represents a function?

Answer 1

x2 + y2 = 9
{(4, 2), (4, –2), (9, 3), (9, –3)}
x = 4
2x + y = 5

Answer 2

a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one outpu

Answer 3

An example is the function that relates each real number x to its square x2.

Answer 4

So take what you can outve that info

Answer 5

hmm ok

Answer 6

im still a little lost

Answer 7

https://en.wikipedia.org/wiki/Function_(mathematics) This article should help you

Answer 8

check this condition for each

Answer 9

So it would be C?

Answer 10

for one x there should be maximum one y

Answer 11

in c for x=4 there can be infinite y-s

Answer 12

Oh in that case it is either A or D

Answer 13

A would make a circle, which is not a function, because x values repeat with different y values

Answer 14

So A is not a function