Anonymous

It is the equation of a circle with a center at (0. 0) and a radius of 1

Anonymous

No, it's not. That equation is a circle, and it is not a function of x or y (it fails both the vertical and horizontal line tests).

Anonymous

No. It is the equation of a circle of radius 1, centered at (0,0)

Anonymous

Equation can not be a function. f(x,y) = x^2+y^2 is a function.

Anonymous

That equation does not define a "function," because most values of x produce two different values of y. PARTS of the given curve could define a function, e.g., y = + |sqrt(1 - x^2)|.

Anonymous

No, for some inputs, x, there are multiples outputs, y.