Solve the system of equations by Gaussian elimination. If there is an unlimited number of solutions, find two of them.-3x - y - 9z = -21 2x + 9y - 4z = 79 6x - 2y + z = -11
A. Inconsistent
B. x = 1, y = 1, z = 9
C. Unlimited: x = 1, y = 9, z = 1, x = 1, y = 1, z = 9
D. x = 1, y = 9, z = 1
Answer: D
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