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OpenStudy (anonymous):
Solve the system of equations using matrices. Use Gaussian elimination with back-substitution. x + y + z = -5 x - y + 3z = -1 4x + y + z = -2 A. {( 1, -4, -2)} B. {( -2, 1, -4)} C. {( 1, -2, -4)} D. {( -2, -4, 1)} I have no idea how to do this.
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