Pls awsner this question for math2

In functions for every x corresponds with only one y.

In given example if x=0, it gives you 2 valus.

So this is not a function.

This is an equation of a circle with starting point (0;0) and Radius of 4;

+ the equation is x^2 + y^2 = R^2.

"if it is my birthday, then it is snowing"