$\"\"$

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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 (2) by 12. \ \ $\"\"$

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$\"\"$ Equation (3)

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Subtract the equation (1) and equation (3) to eliminate the s variable.

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$\"\"$ (Subtract the corresponding columns) $\"\"$ \ \ Divide each side by negative 2.

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$\"\"$

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$\"\"$

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$\"\"$

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

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$\"\"$

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Product of two different sings is negative.

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$\"\"$

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Apply addition property of equality: If a = b then a + b = b + a.

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Add 12 to each side.

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

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$\"\"$

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$\"\"$

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

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Divide each side by 2.

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$\"\"$

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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 $\"\"$ .