You can put this solution on YOUR website! How do you mean, "how would you solve..."? You have an equation of a circle; nothing more. What do you want from it? You could arrange it solved for x or you could arrange it solved for y. For either of those, use the number properties that you are learning.
The equation is better shown as . You can put it into function form:
If this must stay within real numbers, then the acceptable values for x is the set .