Solve the system. Express the solution in the form (x, y, z, w).6x + 6y - 4z + w = -40-x + y + 5z - w = 206x - y + z + 5w = 12  x + y + 6z - w = 29

A. {(2, -10, -5, -2)}
B. {(2, -5, 5, -2)}
C. {(-2, -5, 5, -4)}
D. {(5, -3, 2, -4)}


Answer: B

Mathematics

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A.

 or 
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  or 
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