Does the equation x squared plus y equal 16 define y as a function of x?

AAAaannndd the bot gets it wrong yet again!

x^2 + y = 16
y = 16-x^2
so, yes, y is a function of x

No, this equation does not define y as a function of x. To define y as a function of x, the equation would need to be written as y = f(x).