Assinale a alternativa que apresenta um sistema de equações lineares equivalente ao sistema: open curly brackets table attributes columnalign left...

Assinale a alternativa que apresenta um sistema de equações lineares equivalente ao sistema: open curly brackets table attributes columnalign left end attributes row cell 3 x plus y equals 1 end cell row cell x minus y equals negative 9 end cell end table close a. open curly brackets table attributes columnalign left end attributes row cell 3 x plus y equals 2 end cell row cell x minus y equals negative 9 end cell end table close b. open curly brackets table attributes columnalign left end attributes row cell 3 x plus y equals 1 end cell row cell 2 x plus 2 y equals negative 9 end cell end table close c. open curly brackets table attributes columnalign left end attributes row cell x plus 2 y equals 4 end cell row cell x minus y equals negative 9 end cell end table close d. open curly brackets table attributes columnalign left end attributes row cell 3 x plus y equals negative 9 end cell row cell x minus y equals 1 end cell end table close e. open curly brackets table attributes columnalign left end attributes row cell x plus 2 y equals 12 end cell row cell 2 x plus 2 y equals 10 end cell end table close