$\"\"$

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

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$\"\"$ ------------------> (1)

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$\"\"$ ------------> (2)

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$\"\"$ -------------> (3)

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Use substitute to make a system of two equations in two variables.

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Rewrite the equation $\"\"$ .

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Divide each side by negative 4.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Substitute $\"\"$ value in equation (2).

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$\"\"$

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$\"\"$

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Add 10 to each side.

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$\"\"$

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$\"\"$

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$\"\"$

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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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$\"\"$

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

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$\"\"$

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$\"\"$

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Subtract 15 from each side.

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$\"\"$

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$\"\"$

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$\"\"$

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Divide each side by negative 7.

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$\"\"$

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$\"\"$

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$\"\"$

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The values are $\"\"$ .