TeX Quellcode:

\begin{array}{crcrcrcrl} \text{I} & 4x &+& 5y &-& 8z &=& 21 \cr \text{II} & -2x &+& 3y &-& 6z &=& -17 \cr \text{III} & 2x &+& 8y &-& 14z &=& 4 \cr \cr \text{I} & 4x &+& 5y &-& 8z &=& 21 \cr \text{I+2II} & & & 11y &-& 20z &=& -13 \cr \text{II+III} & & & 11y &-& 20z &=& -13 \cr \cr \text{I} & 4x &+& 5y &-& 8z &=& 21 \cr \text{II'} & & & 11y &-& 20z &=& -13 \cr \text{II'-III'} & & & 0y &+& 0z &=& 0 & \end{array}