{4x + 3y = -6 2x= -5y =16

Giải thích các bước giải:

$\left\{\begin{matrix}4x + 3y = -6\\ 2x - 5y = 16\end{matrix}\right.$

$\Leftrightarrow \left\{\begin{matrix}4x + 3y = -6\\ 4x - 10y = 32\end{matrix}\right.$

$\Leftrightarrow \left\{\begin{matrix}13y = -38\\ 2x - 5y = 16\end{matrix}\right.$

$\Leftrightarrow \left\{\begin{matrix}y = -\dfrac{38}{13}\\ 2x - 5.\left ( -\dfrac{38}{13} \right ) = 16\end{matrix}\right.$

$\Leftrightarrow \left\{\begin{matrix} x = \dfrac{9}{13}\\ y = -\dfrac{38}{13} \end{matrix}\right.$