$\"\"$

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The equations are

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$\"\"$ (Equation 1)

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$\"\"$ (Equation 2)

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Since $\"\"$

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Rewrite the second equation for x.

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$\"\"$

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$\"\"$

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Apply addition property of equality: Add 9 to each side.

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$\"\"$

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Apply additive identity property: $\"\"$ )

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$\"\"$ (Add: $\"\"$ ) $\"\"$

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Now Substitute 8 for x in either equation to find the value of y.

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$\"\"$ (Equation 1)

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$\"\"$ (Replace x by 8)

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$\"\"$ (Multiply: $\"\"$ ) $\"\"$

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Apply subtraction property of equality: Subtract 16 from each side.

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$\"\"$

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Apply commutative property of addition: $\"\"$ .

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$\"\"$

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Apply additive identity property: $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ ) $\"\"$

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$\"\"$ (Multiply each side by negative one)

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$\"\"$ (Product of two same signs is positive)

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The solution is $\"\"$ $\"\"$

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The solution is $\"\"$ .