$\"\"$

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

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Let $\"\"$ , $\"\"$ and $\"\"$ .

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$\"\"$

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The original system of equations can be written in matrix equation as $\"\"$ .

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Multiply each side by $\"\"$ .

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$\"\"$ .

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Find $\"\"$ .

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$\"\"$ .

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Formula for the inverse matrix : $\"\"$ .

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Determinant of $\"\"$ is $\"\"$ .

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$\"\"$

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$\"\"$ \ \

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$\"\"$

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Substitute the corresponding values in above formula.

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$\"\"$

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The inverse of A is $\"\"$ .

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$\"\"$

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Find $\"\"$ .

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$\"\"$ .

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$\"\"$ .

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$\"\"$ .

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$\"\"$ .

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$\"\"$

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The solution is $\"\"$ .