$\"\"$

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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 c.

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$\"\"$ (Add 5d to each side)

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$\"\"$

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$\"\"$

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

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ (Subtract 4 from each side)

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$\"\"$

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$\"\"$

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$\"\"$ (Divide each side by 11)

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d = 0

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Substitute d = 0 in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The solution is $\"\"$ .