$\"\"$

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Elimination method:

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

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

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

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In the above system the coefficients of x - variable are same. $\"\"$

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Subtract 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 12.

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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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Subtract 15 from each side.

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$\"\"$

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$\"\"$

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Divide each side by 6.

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$\"\"$

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$\"\"$

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$\"\"$

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The solution is $\"\"$ .