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OpenStudy (anonymous):
If you were to use the substitution method to solve the following system, choose the new system of equations that would result if x was isolated in the second equation. 3x + y + 2z = 1 x + 2y – z = –8 3x – y – 3z = 18 Answers: 7y – z = 25 5y – 6z = 42 –5y + 5z = 25 –7y = 42 7x + 3z = –10 0x – 5z = 19 –5x – 5z = –10 6x – z = 19
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