conqueror

Equations of circles are not functions.They are equations in two unkowns.Isn't it?

野孩子

I am not too clear of wat u are asking?

Eraser

let co-ordinate of centre of circle be (a,b)

radius of circle be r

equation of this circle is  (x-a)^2+(y-b)^2=r^2

conqueror

I am asking whether equations of circles are functions.

007and911

they are two function
f(x):x^2+Ax+B
g(x):y^2+Dy+E
circle:x^2+y^2+Ax+Dy+(B+E)