Question

Find center and radius of circle (x-9)^2+(y+1)^2=49

Answer 1

Equation of circle:

(x-a)^2+(y-b)^2=R^2

a-Distance between center and y axis
b-Distance between center and x axis

In this case:

a=9
b=-1 Becouse [y-(-1)]=y+1
R=7