Para \( s = 1 \) $$ \begin{align*} k_{1} &= f(t_{n}, y_{n}) \\ y_{n+1} &= y_{n} + h b_{1} k_{1} \end{align*} $$
tabla de Butcher
\begin{array}{c|c} 0 & \\ \hline & 1 \end{array}
reemplazando se obtiene el método de Euler $$ \begin{align*} k_{1} &= f(t_{n}, y_{n}) \\ y_{n+1} &= y_{n} + h k_{1} \end{align*} $$