Solve the system of equations using matrices. Use Gaussian elimination with back-substitution. x + y + z=-5 x - y + 4z=-134x + y + z=-2
A. {(1, -4, -2)}
B. {(-4, 1, -2)}
C. {(1, -2, -4)}
D. {(-4, -2, 1)}
Answer: C
Mathematics
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