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Mathematics 22 Online
OpenStudy (anonymous):

Solve x + 2y + z = 5 2x – y + z = 4 3x + y + 4z = 1 using matrices.

OpenStudy (primeralph):

Add 2 and 3. Then add 1 and 2. Add 1, 2 and 3. You get two new equations with only two terms.

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