Question

{3x + y = 2
{X -2y = -4

Answer 1

$\large\boxed{\begin{array}{l} \underline{ \sf{m\acute{e}todo\,da\, substituic_{\!\!,}\tilde{a}o}} \\ \\ \begin{cases} \sf \: 3x + y = 2 \\ \sf \: x - 2y = - 4\end{cases} \\ \\ \begin{cases} \sf \: y = 2 - 3x \\ \sf \: x - 2y = - 4 \end{cases} \\ \\ \sf \: x - 2(2 - 3x) = - 4 \\ \\ \boxed{ \boxed{ \sf{x = 0}}} \\ \\ \sf \: y = 2 - 3 \times 0 \\ \\ \boxed{ \boxed{ \sf{y = 2}}}\end{array}}$