Question

Qual é o par ordenado que resolve o sistema a sequir x+y=1 -x+y=1

Answer 1

$\Large\boxed{\begin{array}{l}+\underline{\begin{cases}\sf \backslash\!\!\!x+y=1\\\sf -\backslash\!\!\!x+y=1\end{cases}}\\\sf 2y=2\\\sf y=\dfrac{2}{2}\\\\\sf y=1\\\sf x+y=1\\\sf x+1=1\\\sf x=1-1\\\sf x=0\\\sf S=\{0,1\}\end{array}}$