Question 636094
The matrix 


<img src="http://latex.codecogs.com/gif.latex?\left[ \begin{array}{ccc|c}9 & 4 & 5 & -2 \\5 & 0 & 9 & 4 \\8 & 5 & 0 & 2 \\ \end{array}\right]" title="x" />


turns into the system of equations


<img src="http://latex.codecogs.com/gif.latex?\begin{array}{rl} 9x+4y+5z &= -2 \\ 5x+0y+9z &= 4 \\ 8x+5y+0z &= 2 \end{array}" />


which simplify to 


<img src="http://latex.codecogs.com/gif.latex?\begin{array}{rl} 9x+4y+5z &= -2 \\ 5x \ \ \ \ \ \ \ +9z &= 4 \\ 8x+5y \ \ \ \ \ \ \ &= 2 \end{array}" />