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The two circle equations are $\"\"$ and $\"\"$ .

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Convert the circle equations into standard form by using completing square method.

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Find the center of $\"\"$ .

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Circle equation $\"\"$ .

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$\"\"$

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To complete the square add $\"\"$ and $\"\"$ to each side of equation.

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$\"\"$ $\"\"$ .

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$\"\"$ $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Compare it with standard form.

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Center $\"\"$ .

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Find the center of $\"\"$ .

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Circle equation $\"\"$ .

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$\"\"$

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To complete the square add $\"\"$ and $\"\"$ to each side of equation.

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$\"\"$ $\"\"$

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$\"\"$ $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Compare it with standard form.

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Center $\"\"$ .

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The line passes through the centers of the two circles.

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The line equation passing two points is $\"\"$ .

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$\"\"$ and $\"\"$ .

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Substitute the above values.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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The line equation is $\"\"$ .