\"\"

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The system of 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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Apply addition property of equality: Add 3d to each side.

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\"\"

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\"\"(Apply additive inverse property: \"\")

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\"\"      (Apply additive identity property: \"\")

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\"\"

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Apply division property of equality: Divide each side by 9.

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\"\"

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\"\" (\"\")

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\"\"                      (Cancel common terms)

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\"\"

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Substitute \"\" in equation (2).

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\"\"

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\"\"  (\"\")

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\"\" (Cancel common terms)

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Distribute terms using distributive property: a( b + c ) = ab + ac.

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\"\"

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\"\"    (Multiply: \"\")

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\"\"            (Add: \"\")

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\"\"\"\"(Add 22 to each side)

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Rearrange the terms using commutative property of addition: a + b = b + a.

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\"\"

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\"\"             (Apply additive inverse property: \"\")

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\"\"                   (Apply additive identity property: \"\")

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\"\"                            (Add: \"\")

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\"\"

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\"\"       (Divide each side by 7)

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\"\"            (Cancel common terms)

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\"\"                 (Divide: \"\")\"\"

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Now, find the c value by substitute  \"\" in \"\".

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\"\"

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\"\"            (Add: \"\")

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\"\"              (Divide: \"\")\"\"

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The system of solution is \"\".