Here is the practice for circles and ellipses. You will first need to divide by both coefficients (the numbers in front of x and y). This will either resolve cleanly, giving you a radius for a circle OR it will not divide cleanly and leave an 'a' value and 'b' value below x and y (which should also give you =1 at the end for an ellipse).
Practice makes perfect!
Circles & Ellipses
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