$\"\"$

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The equations are

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$\"\"$ Equation (1)

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$\"\"$ Equation (2)

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$\"\"$ Equation (3) $\"\"$

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The second equation is $\"\"$ .

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Apply division property of equality: if a = b, then $\"\"$ .

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$\"\"$ (Divide each side by 5)

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$\"\"$ (Cancel common terms)

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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Substitute 3 for a in equation (1).

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$\"\"$

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

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Apply subtraction property of equality: if a = b, then $\"\"$ .

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$\"\"$ (Subtract 6 from each side)

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

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

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$\"\"$

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Substitute $\"\"$ and $\"\"$ in equation (3).

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$\"\"$

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

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Apply subtraction property of equality: if a = b, then $\"\"$ .

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$\"\"$ (Add 1 to each side)

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

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$\"\"$

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The solution is $\"\"$ .