Question

$x - y = 5 \\ x + y = 7$
resolvam essa p mum pff​

Answer 1

Resposta: x=6 e y=1

Explicação passo a passo:

Isolar x de x-y=5 : x=5+y

$\mathrm{Substituir\:}x=5+y\\\begin{bmatrix}5+y+y=7\end{bmatrix}\\Simplificar\\\begin{bmatrix}5+2y=7\end{bmatrix}$

Isolar y de 5 =2y =7 : y =1

$\mathrm{Para\:}x=5+y\\\mathrm{Substituir\:}y=1\\x=5+1=6$