The following system does not have a unique solution. Solve the system.
A. infinitely many solutions of the form x = 20 - 
z, y = 3 - 
z, z = z
B. infinitely many solutions of the form x = 20 + 
z, y = -3 - 
z, z = z
C. infinitely many solutions of the form x = 20 + 
z, y = 3 - 
z, z = z
D. infinitely many solutions of the form x = 20 + 
z, y = 3 + 
z, z = z
Answer: B
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