Hệ phương trình \(\left\{ \begin{array}{l}y - \dfrac{x}{2} = 2\\\dfrac{3}{2}x + y = 42\end{array} \right.\)

* Hướng dẫn giải

 \(\begin{array}{l}\,\,\left\{ \begin{array}{l}y - \dfrac{x}{2} = 2\\\dfrac{3}{2}x + y = 42\end{array} \right.\\ \Leftrightarrow \left\{ \begin{array}{l}2x = 40\\y - \dfrac{x}{2} = 2\end{array} \right.\\ \Leftrightarrow \left\{ \begin{array}{l}x = 20\\y - 10 = 2\end{array} \right.\\ \Leftrightarrow \left\{ \begin{array}{l}x = 20\\y = 12\end{array} \right.\end{array}\)