Solve the system of equations using matrices. Use Gaussian elimination with back-substitution. x + y + z - w=6 2x - y + 3z + 4w=-4 4x + 2y - z - w=-13 -x - 2y + 4z + 3w=12
A. {(- 
, 
, 
, - 
)}
B. {(4, -3, -5, 2)}
C. {(
, - 
, - 
, 
)}
D. {(-4, 3, 5, -2)}
Answer: D
Mathematics
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