Question

Eqn of a circle has radius 3 and its center lies on y=x-1

Answer 1

equation of circle

if r=3,

centre lies at y=x-1

let centre of the circle (a,b)

b=a-1

centre(a,a-1)

equation of circle

x^2+y^2=r^2

(x-a)^2 + (y-a+1)^2=9