Question

{x + 2y = 0
3x + 5y = 0

Answer 1

$\begin{cases}\sf x + 2y = 0 \\ \sf 3x + 5y = 0\end{cases}$

$\begin{cases}\ \sf x = - 2y \\ \sf3x + 5y = 0\end{cases}$

$\sf3 \times ( - 2)y + 5y = 0$

$\sf y = 0$

$\sf x = 0$

s = {0, 0}