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