## Algebra and Trigonometry 10th Edition

The reduced row-echelon form of the matrix is: $\begin{bmatrix} 1 & 0 & 0 & 0 & |1\\ 0 & 1 & 0 & 0 & |0\\ 0 & 0 & 1 & 0 & |4\\ 0 & 0 & 0 & 1 & |-2\\ \end{bmatrix}$ From reduced row-echelon form the solution is simple: x = 1 y = 0 z = 4 w = -2