Question

-×+y=2
×+y=-2
qual a resposta?​

Answer 1

$\large\bm{}\begin{cases} - x + y = 2 \\ x + y = - 2\end{cases} \\ \\ \large\bm{}\begin{cases} - x + y = 2 \\ y = - 2 - x\end{cases} \\ \\ \large\bm{} - x - 2 - x = 2 \\ \\ \large\bm{}x = - 2 \\ \large\bm{}y = - 2 - \left( - 2\right) \\ \large\bm{}y = 0 \\ \\ \large\bm{}\left(x,y\right) = \left( - 2,0\right) \\ \\\large\bm{} \begin{cases} - \left( - 2\right) + 0 = 2 \\ - 2 + 0 = - 2\end{cases} \\ \\ \large\bm{}\begin{cases}2 = 0 \\ - 2 = - 2\end{cases} \\ \\ \large\bm{s \{\left(x,y\right) = \left( - 2,0\right)} \}$

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