Solve:

x1 + x2 – x3 = – 3

6x1 + 2x2 + 2xc3 = 2

– 3x1 + 4x2 + x3 = 1

With 

(a) naïve Gauss elimination,

(b) Gauss elimination with partial pivoting, and

(c) Gauss-Jordan without partial pivoting.