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OpenStudy (mojutmnt):
The following system is solved by substitution. Which expression is substituted for z in the second and third equations? x + 5y – z = 6 3x – y – 2z = 4 3x – 2y + 3z = 13 A. x + 5y + 6 (I choose this one) B. x + 5y – 6 C. –x – 5y + 6 D. –x – 5y – 6 Am I correct? If not why?
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