Which is NOT a function?

A.y-x=6
B.y=2x
C.x=-2
D.y+x=12
I think the answer is B, but I'm not too sure. please help me I'm relly struggling

6 answers

Well, a function is a expression that uses one or more variables.
oooh so would it be C?
@Emma Helper did you know you can help people on Brainly! I help people here and at brainy!
yes, C
a function is a relation between two variables. C has only a single variable.
Thank you @oobleck
Peer Tutor, oooh cool! I'll do that