TeX Quellcode:

\begin{array}{crclllcc} \text{I} & \dfrac{1}{4}x+\dfrac{3}{8}y &=& -\dfrac{5}{8} \cr \cr \text{II} & -\dfrac{1}{4}x-\dfrac{2}{3}y &=& \dfrac{1}{3} \cr \cr \cr \text{I} & \dfrac{1}{4}x+\dfrac{3}{8}y &=& -\dfrac{5}{8} \cr \cr \text{I+II} & -\dfrac{7}{24}y &=& -\dfrac{7}{24} & \Rightarrow y = 1 \cr \cr \cr y=1 \text{ in I} & \dfrac{1}{4}x+\dfrac{3}{8} \cdot 1 &=& -\dfrac{5}{8} &\vert -\dfrac{3}{8} \cr \cr & \dfrac{1}{4}x &=& -1 & \Rightarrow x = -4 \cr \cr \cr & \mathbb{L} &=& \{\left(-4; 1\right)\} \end{array}