Solve the system using Gaussian elimination. -3x - 9y + 9z = 42 9x + 27y - 27z = -126-12x - 36y + 36z = 168
A. {(x, y, z) 
-3x - 9y + 9z = 42}
B. ?
C. {(x, y, z) 
-12x - 36y + 36z = 42}
D. {(-8, -9, -7)}
Answer: A
Mathematics
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