Linear Algebra With Applications
3. b. The matrix is already in reduced row-echelon form. The nonleading variables are parameters; x2 =r, x4 =s and x 6 =t. The first equation is x1 −2x2 +2x4 +x 6 =1, whence x1 =1+2r−2s−t. The second equation is x3 +5x4 −3x 6 =−1, whence x3 =−1−5s+3t. The third equation is x 5 +6x 6 =1, whence x " # → " # → " #
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