$\"\"$

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

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Solve the equation.

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$\"\"$ (Second equation)

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

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

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Substitution method.

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$\"\"$ (First equation)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Distributive property: $\"\"$ )

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$\"\"$ (Combine like terms)

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

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

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

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$\"\"$ (Cancel common terms)

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$\"\"$

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Find the $\"\"$ value:

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$\"\"$ (Simplified second equation)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ )

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The system of solution is $\"\"$ and $\"\"$ .

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$\"\"$

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Option C is right choice.