Question

Resolva o sistema de equações { X - Y = 3 e 2x + Y = 12}​

Answer 1

Resposta:

considere a primeira equação 2×de ambos os lados

X-Y-2×=3+Y

Explicação passo-a-passo:

RESPOSTA X=7Y= -5

Answer 2

$\LARGE\displaystyle{}\begin{cases}x - y = 3 \\ \\ 2x + y = 12\end{cases} \\\\ \LARGE\displaystyle{}\begin{cases}x - y = 3 \\ \\ y = 12 - 2x\end{cases} \\\\ \LARGE\displaystyle{}x - \left(12 - 2x\right) = 3 \\\\ \LARGE\displaystyle{}x = 5 \\\\ \LARGE\displaystyle{}y = 12 - 2 \times 5 \\ \\ \LARGE\displaystyle{}y = 2 \\ \\ \LARGE\displaystyle\text{ \begin{gathered} \underline{\boxed{\boldsymbol{ \left(x,y\right) = \left(5,2\right)}}}\end{gathered} }$

$\LARGE\displaystyle\text{ \begin{gathered} \underline{\boxed{\boldsymbol{{ \red{Bons}} \blue{\:Estudos}}}}\end{gathered} }$