$\"\"$

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The matrix is $\"\"$ .

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(a) Add $\"\"$

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$\"\"$

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(b) Interchanged $\"\"$

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$\"\"$ $\"\"$

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(c) Add 3 times $\"\"$

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$\"\"$

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(d) Add $\"\"$

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$\"\"$ $\"\"$

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(e) Multiply $\"\"$

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$\"\"$

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(f) Add $\"\"$

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$\"\"$ $\"\"$

\

Add $\"\"$

\

$\"\"$

\

Add $\"\"$

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$\"\"$

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The matrix is in reduced row-echelon form because every column that has a leading 1 has zeros in every position above and below its leading 1. $\"\"$

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The matrix is in reduced row-echelon form.