Precalculus Examples

$2 x - y + 2 z + w = 5$ , $- x + y + 4 z - w = 3$ , $3 x - 2 y - z = 0$

Step 1

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$2 x - y + 2 z + w = 5, - x + y + 4 z - w = 3, 3 x - 2 y - z = 0$