SOLUTION: Solve: use the Gausd-Jordan elimination (RREF) -3 1 -1 4 2 -1 1 -8 4 -3 2 12

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Question 1140945: Solve: use the Gausd-Jordan elimination (RREF)
-3 1 -1 4
2 -1 1 -8
4 -3 2 12

Answer by MathLover1(20850)   (Show Source): You can put this solution on YOUR website!

Your matrix


Make the pivot in the 1st column by dividing the 1st row by :



Eliminate the 1st column:




Make the pivot in the 2nd column by dividing the 2nd row by :





Eliminate the 2nd column:


Find the pivot in the 3rd column in the 3rd row (inversing the sign in the whole row)



Eliminate the 3rd column:



Solution set:





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