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Which is NOT a function?

A
y – x = 6

B
y = 2x

C
x = -2

D
y + x = 12

I don't understand what a function is, and my answer choice is D, if I'm wrong, please help

2 answers

How could you have chosen D if you admit not knowing what a function is ??
You just guessed and want somebody to just give you the answer.

btw, your guess was wrong, I suggest you study what a function is.
https://www.mathsisfun.com/sets/function.html