Respuesta :

[tex] \bf \begin{array}{|cc|ll}
\cline{1-2}
x&y\\
\cline{1-2}
4&\stackrel{\frac{4}{2}-1}{1}\\&\\
6&\stackrel{\frac{6}{2}-1}{2}\\&\\
8&\stackrel{\frac{8}{2}-1}{3}\\
&\\
\cline{1-2}
\end{array} [/tex]