Solve the system by using Gaussian elimination with backward substitution or by reducing the matrix to reduced-row echelon form. x + y + z = -3 x - y + 2z = -144x + y + z = -15
A. (-4, 4, -3)
B. (-3, 4, -4)
C. (-3, -4, 4)
D. No solution
Answer: A
Mathematics
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