Question

me ajudem!!
Resolva os sistemas abaixo utilizando o método da adição
a) x+y=7
x-y=1

b) 2x-y=5
x+y=4​

Answer 1

$\large\boxed{\begin{array}{l}\rm Resolva~os~sistemas~abaixo~utilizando\\\rm o~m\acute etodo~da~adic_{\!\!,}\tilde ao\\\tt a)~\begin{cases}\sf x+y=7\\\sf x-y=1\end{cases}\\\\\tt b)\begin{cases}\sf 2x-y=5\\\sf x+y=4\end{cases}\end{array}}$

$\large\boxed{\begin{array}{l}\underline{\rm soluc_{\!\!,}\tilde ao\!:}\\\tt a)+\underline{\begin{cases}\sf x+\backslash\!\!\!y=7\\\sf x-\backslash\!\!\!y=1\end{cases}}\\\sf 2x=8\\\sf x=\dfrac{8}{2}\\\sf x=4\\\sf x+y=7\\\sf 4+y=7\\\sf y=7-4\\\sf y=3\\\sf S=\{(4,3)\}\\\tt b)~+\underline{\begin{cases}\sf 2x-\backslash\!\!\!y=5\\\sf x+\backslash\!\!\!y=4\end{cases}}\\\sf 3x=9\\\sf x=\dfrac{9}{3}\\\sf x=3\\\sf x+y=4\\\sf 3+y=4\\\sf y=4-3\\\sf y=1\\\sf S=\{(3,1)\}\end{array}}$