Question

entre pares e valores dados qual que satisfaz simultaneamente as equaçoes x-y= 1 e 2x-3y=o ?

Answer 1

$\left \{ {{x-y=1. (-3)--\ \textgreater \ -3x+3y=-3} \atop---------\ \textgreater \ {2x-3y=0}} \right. (+)-x=-3;x=3;x-y=1;3-y=1;$$3-1=y;y=2; (3;2)$