Question

porfaor es para un examen

Answer 1

Respuesta:

$a\ne \:-\frac{13}{2}$

Explicación paso a paso:

$\begin{bmatrix}3x+\left(a+2\right)y=1\\ 5x+\left(a-1\right)y=13\end{bmatrix}\\\\\begin{bmatrix}5\cdot \frac{1-y\left(a+2\right)}{3}+\left(a-1\right)y=13\end{bmatrix}\\\\\begin{bmatrix}\frac{-2ay-13y+5}{3}=13\end{bmatrix}\\\\x=\frac{1-\left(-\frac{34}{2a+13}\right)\left(a+2\right)}{3}\\\\x=\frac{3\left(4a+9\right)}{2a+13}\\\\x=\frac{3\left(4a+9\right)}{2a+13},\:y=-\frac{34}{2a+13}\\\\a\ne \:-\frac{13}{2}$