$\"\"$

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The circle equation is $\"\"$ .

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$\"\"$ (Take out common factor)

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$\"\"$ (Divide each side by 3)

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$\"\"$ (Simplify)

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$\"\"$

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$\"\"$

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(Compare the equation with $\"\"$ )

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Center (h, k) = $\"\"$ and radius(r) = $\"\"$ .

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$\"\"$

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The circle equation is $\"\"$ .

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$\"\"$ (Take out common factor)

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$\"\"$ (Divide each side by 3)

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$\"\"$ (Simplify)

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$\"\"$ (Simplify)

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$\"\"$ (Simplify)

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$\"\"$

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Graph the circle with center $\"\"$ and radius $\"\"$ .

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$\"graph$ $\"\"$

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Therefore,

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(a)Center (h, k) = $\"\"$ and radius(r) = $\"\"$ .

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(b)