Answer:
B
Step-by-step explanation:
To be a function every input must have exactly one output. There are two input values with 2, therefore this makes it not a function.
First, we are going to rewrite it as a parabola equation.
Rewrite.

Divide by 8.

Factor out coefficient.

Then, we are going to convert x into square form.

Convert the whole expression into square form.

Simplify.

Subtract 6 from both sides.

Divide by coefficient.

Rewrite in standard form.
The radius of the circle will be -2. Also, no matter what the sign says, the radius has to always be positive.
Have a nice day! :)
It is the same beacuse x is equal to y so x and y both equal 22