$\"\"$

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

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Observe the coefficient of each term, the coefficient of x - term has opposite coefficients, so the best method is Elimination using addition method to solve the system of equations.

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Elimination using addition:

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$\"\"$ ----------(1)

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$\"\"$ ----------(2) $\"\"$

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Add the equations to eliminate the x - variable and solve the equation.

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$\"\"$

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The resultant equation is $\"\"$ .

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Divide each side by negative 10.

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$\"\"$

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$\"\"$

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$\"\"$

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The value of $\"\"$ substitute in either equation to find x.

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Second equation: $\"\"$ .

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$\"\"$

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$\"\"$

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Add 6 to each side.

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$\"\"$

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$\"\"$

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Divide each side by negative 3.

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$\"\"$

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$\"\"$

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$\"\"$

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The solution is $\"\"$ .