$\"\"$

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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 first equation for x.

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$\"\"$

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$\"\"$

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Apply subtraction property of equality: Subtract 2x 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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\

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Now Substitute $\"\"$ for y in either equation to find the value of x.

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$\"\"$ (equation 2)

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$\"\"$ (Replace $\"\"$ )

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

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

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$\"\"$

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

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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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Apply division property of equality: Divide each side by 6.

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$\"\"$

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$\"\"$ (Cancel common terms)

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$\"\"$ (Cancel common terms) $\"\"$

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Now $\"\"$

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$\"\"$ (Replace y by $\"\"$ )

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

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

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

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The solution is $\"\"$ .