The augmented matrix is given for a system of equations. If the system is consistent, find the general solution. Otherwise state that there is no solution. 
A. x1 = -7 - 4x2 - 5x4
x2 is free
x3 = -4 - 4x4
x4 is free
B. x1 = -7 - 4x2 - 5x3
x2 = -4 - 4x3
x3 is free
C. x1 = - 4x2 +2x3 + 3 x4 + 1
x2 is free
x3 = -4 - 4x4
x4 is free
D. x1 = -7 - 4x2 - 5x4
x2 is free
x3 = -4 - 4x4
x4 = 0
Answer: A
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