$\"\"$

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The equations are $\"\"$ and $\"\"$ .

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$\"\"$ Equation (1)

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$\"\"$ Equation (2)

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Solve the first equation for r.

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Add s to each side.

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$\"\"$

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$\"\"$

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$\"\"$

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Divide each side by 5.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Since $\"\"$ , substitute $\"\"$ for r in the second equation.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Add 4 to each side.

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$\"\"$

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$\"\"$

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Multiply each side by 5.

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$\"\"$

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$\"\"$

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$\"\"$

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Divide each side by 11.

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$\"\"$

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$\"\"$

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The solution is $\"\"$ .