1.

The solution of the equations5x1 + x2 + x3 + x4 = 4x1 + 7x2 + x3 + x4 = 12x1 + x2 + 6x3 + x4 = - 5x1 + x2 + x3 + 4x4 = - 6By Gauss - Jordan method is

A. -1, -2, 1, 2
B. -1, -2, -1, 2
C. -1, 2, -1, 2
D. 1, 2, -1, -2
Answer» E.


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