$\"\"$

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Solve the system of equation using Elimination Method:

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The equations are

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$\"\"$ Equation (1)

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$\"\"$ Equation (2)

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multiply equation (1) by $\"\"$ .

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$\"\"$

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$\"\"$ Equation (3)

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Eliminate the variable y by addicting the equation (3) from (2).

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

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Combine like terms using distributive property: ab + ac = a( b + c).

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Divide each side by 9.

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$\"\"$

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$\"\"$

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$\"\"$

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Substitute 3 for x in equation (2).

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$\"\"$

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$\"\"$

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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 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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$\"\"$

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Divide each side by negative one.

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$\"\"$

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$\"\"$

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The solution is $\"\"$

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$\"\"$

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The solution is $\"\"$ .