Question

me ajudem a responder x-y=6
x+y=7

Answer 1

$\large\texttt{Vamos L\'a:}$

$\large\texttt{M\'etodo Da Adi\c{c}\~ao:}$

$\left \{ \begin{array} {l} x-y=6\\ x+y=7 \end{array} \right.$

$\left \{ \begin{array} {l} x-\diagup\!\!\!\!y=6\\ x+\diagup\!\!\!\!y=7 \end{array} \right.$

$x+x = 6+7$
$2x = 13$

$\boxed{x = 13/2}$


$x+y = 7$
$13/2 + y =7$
$13/2 + 2y/2 = 14/2$
$13 +2y = 14$
$2y = 14-13$
$2y = 1$

$\boxed{y = 1/2}$


$S =\{( 13/2;1/2)\}$

Bons Estudos!!!
:D

Caso tenha problemas para visualizar a resposta, experimente abrir pelo navegador:http://brainly.com.br/tarefa/7649668


Método da substituição:

$\left \{ \begin{array} {l} x-y=6\\ x+y=7 \end{array} \right.$
$x = y-6$


$x+y = 7$
$y-6+y =7$
$2y = 7+6$
$2y = 13$

$\boxed{y = 13/2}$


$x = y-6$
$x = 13/2 -6$
M.M.C = 2

$2x/2 = 13/2 -12/2$
$2x = 13-12$
$2x = 1$

$\boxed{x = 1/2}$

$S =\{( 13/2;1/2)\}$

Método da comparação:

$\left \{ \begin{array} {l} x-y=6\\ x+y=7 \end{array} \right.$
$x = 6+y$
$x = 7-y$
$x = x$
$6+y = 7-y$
$y+y = 7-6$
$2y = 1$

$\boxed{y = 1/2}$

$x = 6+y$
$x = 6+ 1/2$
M.M.C = 2
$2x/2 = 12/2 + 1/2$
$2x = 12+1$
$2x = 13$

$\boxed{x = 13/2}$

$S =\{( 13/2;1/2)\}$

Bons Estudos!!!