Question 1122298
rewrite the first as x^2+y^2=10
radius is sqrt (10)
center is (0, 0)

rewrite second as 
36x^2-24x +36 Y^2-36y=23
divide by 36
x^2-(2/3)x+y^2-1=23
complete the square 
(x-(1/3))^2+(y-(1/2))^2=23+(1/9)+(1/4)
center is (1/3, 1/2) and radius is sqrt(23 13/36) or sqrt (841/36)=29/6 or 4.8333