Question

Alguém ajuda nesse sistema

Answer 1

Resposta:

$\left \{ {{x=4} \atop {y=1}} \right.$

Explicação passo a passo:

$\left \{ {{-x-y=-5} \atop {2x+y=9}} \right. \\\\\left \{ {{-x-y=-5} \atop {y=9-2x}} \right. \\\\-x-(9-2x)=-5\\\\-x-9+2x=-5\\\\x=9-5\\\\x=4\\\\\\y=9-2(4)\\\\y=9-8\\\\y=1$