Question

quien me ayuda plis ​

Answer 1

Respuesta:

$\begin{bmatrix}5x+7y=74\\ 2x+9y=73\end{bmatrix}\\\\\begin{bmatrix}2\cdot \frac{74-7y}{5}+9y=73\end{bmatrix}\\\\\begin{bmatrix}\frac{148+31y}{5}=73\end{bmatrix}\\\\x=\frac{74-7\cdot \:7}{5}$

x=5

y=7

2)

$\begin{bmatrix}10x+y=34\\ -8x+y=-20\end{bmatrix}\\\\\\\begin{bmatrix}-8\cdot \frac{34-y}{10}+y=-20\end{bmatrix}\\\\\\\begin{bmatrix}\frac{9y-136}{5}=-20\end{bmatrix}\\\\\\x=\frac{34-4}{10}$

x=3

y=4