Question

2x - 11y = 67
2x + 5y = 20
resolver con el método de sustitución ​

Answer 1

Respuesta:

2x - 11y = 67

2x + 5y = 20

$\begin{bmatrix}2x-11y=67\\ 2x+5y=20\end{bmatrix}\\\\\\\begin{bmatrix}2\cdot \frac{67+11y}{2}+5y=20\end{bmatrix}\\\\\begin{bmatrix}67+16y=20\end{bmatrix}\\\\x=\frac{67+11\left(-\frac{47}{16}\right)}{2}\\\\x=\frac{555}{32}\\\\x=\frac{555}{32},\:y=-\frac{47}{16}$