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
To determine which is NOT a function, we need to understand what a function is. In mathematics, a function is a relation between a set of inputs (called the domain) and a set of outputs (called the range) such that each input is associated with exactly one output.
Now let's analyze each equation given:
A) y - x = 6
This equation represents a linear relationship between y and x. For a given value of x, there is only one corresponding value of y. This equation describes a function.
B) y = 2x
This equation represents a linear relationship between y and x with a constant ratio of 2. For a given value of x, there is only one corresponding value of y. This equation describes a function.
C) x = -2
This equation represents a vertical line passing through the x-coordinate -2. For any value of y, there can be multiple values of x. Hence, this equation does not describe a function.
D) y + x = 12
This equation represents a linear relationship between y and x, similar to equation A. For a given value of x, there is only one corresponding value of y. This equation describes a function.
Therefore, the equation that is NOT a function is C) x = -2.
https://www.mathsisfun.com/sets/function.html
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.