TeX Quellcode:

\begin{array}{crclllcc} \text{I} & 2x+6y &=& 14 & \vert & -2x \cr \text{II} & x+6y &=& 13 & \vert & -x \cr \cr \text{I} & 6y &=& 14-2x \cr \text{II} & 6y &=& 13-x \cr \cr \text{I = II} & 14-2x &=& 13-x & \vert & +x -14 \cr & -2x+x &=& 13-14 & \cr & -x &=& -1 & \vert & \cdot (-1) & \Rightarrow & x = 1 \cr \cr x=1 \text{ in I} & 6y &=& 14-2 \cdot 1 \cr & 6y &=& 12 & \vert & :6 & \Rightarrow & y = 2 \cr \cr & \mathbb{L} &=& \{\left(1; 2\right)\} \end{array}