$\"\"$

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Guassian elimination method :

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System of equations are

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$\"\"$

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Eliminate the $\"\"$ terms by using equation $\"\"$ and equation $\"\"$ .

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$\"\"$

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Add equation $\"\"$ and equation $\"\"$ .

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$\"\"$

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$\"\"$

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Eliminate the $\"\"$ terms by using equation $\"\"$ and equation $\"\"$ .

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$\"\"$

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Multiply the equation $\"\"$ by $\"\"$ .

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$\"\"$

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Multiply the equation $\"\"$ by $\"\"$ .

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$\"\"$

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Add equation $\"\"$ and equation $\"\"$ .

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$\"\"$

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$\"\"$

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Solve the equation $\"\"$ and equation $\"\"$ .

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$\"\"$

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Multiply the equation $\"\"$ by $\"\"$ .

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$\"\"$

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Add equation $\"\"$ and equation $\"\"$ .

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ in equation $\"\"$ .

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ and $\"\"$ equation $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$ , $\"\"$ and $\"\"$ $\"\"$

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$\"\"$ .