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# Fill in the blank(s) using elementary row operations to form a row-equivalent matrix.$\left[\begin{array}{rrrr}{2} & {4} & {8} & {3} \\ {1} & {-1} & {-3} & {2} \\ {2} & {6} & {4} & {9}\end{array}\right] \\ \left[\begin{array}{rrrr}{1} & {-1} & {-3} & {2} \\ {2} & {?} & {?} & {?} \\ {2} & {6} & {4} & {9}\end{array}\right] \\ \left[\begin{array}{cccc}{1} & {-1} & {-3} & {2} \\ {0} & {6} & {?} & {?} \\ {0} & {8} & {?} & {?}\end{array}\right]$

Solution

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Our goal is to determine the value of unknown entries by applying elementary row operations.

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