Question

Bom dia gostaria de ajuda nessa atividade:

$\left \{ {{x=3y} \atop {x+2y=10}} \right.$

Answer 1

$\begin{cases}x=3y\\x+2y=10\end{cases}\\\\\\\\ Por~~Substitui{\c c}\~ao:\\\\\\\\x+2y=10\to~~3y+2y=10\to~~ 5y=10\to~~ y= \dfrac{10}{5} \to~~\boxed{y=2} \\\\\\ x=3y\to~~x=3\times2\to~~\boxed{x=6}\\\\\\\\\\ \large\boxed{\boxed{S=\{6;~2\}}}$