What value(s) of k, if any, will the systems have (a) No solution, (b) A unique solution,

Question:

What value(s) of k, if any, will the systems have

(a) No solution,

(b) A unique solution,

(c) Infinitely many solutions?
x + y + z = 2 

x + 4y - z = k 

2x - y + 4z = k2

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