Question

Resolva o sistema e marque o resultado de ( X,Y ) : X-Y=2 X+Y=12

Answer 1

Resposta:

( 7 , 5 )

Explicação passo a passo:

$\left \{ {{x-y=2} \atop {x+y=12}} \right. \\\\x -y = 2\\x = 2 +y\\\\\\x + y = 12\\2 + y + y = 12\\2y = 12 - 2\\2y = 10\\y = 10/2\\y = 5\\\\x - y = 2\\x - 5 = 2\\x = 2 + 5\\x = 7$