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			Results
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After Gaussian elimination, the obtained upper triangular coefficient matrix is as follows:

New A=
	6.0000    2.0000   -8.0000    4.0000   
	0.0000    4.0000    8.0000  -10.0000  
	0.0000    0.0000   12.0000   -2.0000   
	0.0000    0.0000    0.0000   16.1667   

and the obtained right-hand-side vector is as follows:

New b=
        7.0000
      -13.5000
       -1.7500
       15.5625

The obtained solution is as follows:

x=
	0.8769
        -0.9976
	0.0146
	0.9626

where, the numbers at above are accurated to four decimal digits.