Question

Which of the following expressions represents a function?
A. x^2+y^2=9
B. {(4, 2), (4, –2), (9, 3), (9, –3)}
C. x=4
D. 2x+y=5

Answer 1

@thomaster

Answer 2

I think it's B

Answer 3

Thanks @_Malice_ why though :o

Answer 4

@hartnn @mathstudent55

Answer 5

Well, do you know what a function is?

Answer 6

Relation between inputs?

Answer 7

A function is where one input has EXACTLY one output.

Answer 8

Ahhh ok, so it would be (B). Thank you <3 :)

Answer 9

np

Answer 10

ur answer is D. A function cannot have repeating x terms....it can have repeating y terms, just not the x's.
2x + y = 5...solve for y
y = -2x + 5
y is the same as f(x)...so f(x) = -2x + 5...this is a function