# How do you find the center and radius of the circle #9x^2+9y^2+6y-107=0#?

##### 1 Answer

Jun 17, 2016

#### Explanation:

you can write the equivalent equation by dividing all terms by 9:

you obtain the center of the circle by using the formulas:

and radius by

where a, b, c are in the following general circle equation:

So