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Find the centre and radius of each circle with equations as given

(a) 3x^2 + 3y^2 = 81

(b) x^2 = 6y - y^2

I really don't know how to approach this question, i started (a) by dividing both sides by 3 but then i don't know where to go from there, and i don't even know how to do (b)...please help me