$\"\"$

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The system of equations is $\"\"$ .

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Subtract first and second equations.

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$\"\"$

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Divide each side by 2.

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$\"\"$

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$\"\"$

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$\"\"$

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The power of $\"\"$ .

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$\"\"$

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Apply square roots on each side and eliminate squares.

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$\"\"$

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$\"\"$

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Now solve for y, and substitute $\"\"$ in $\"\"$ .

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$\"\"$

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Evaluate powers $\"\"$ .

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

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Subtract 16 from each side.

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$\"\"$

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$\"\"$

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The power of $\"\"$ .

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$\"\"$

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Apply square roots on each side and eliminate squares.

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$\"\"$

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$\"\"$

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The solutions are $\"\"$ .