Question

y=2x
x-y = 3 помогите решить ​

Answer 1

$\left \{ {{y=2x} \atop {x-y =3}} \right.\\ \left \{ {{y=2x} \atop {x-2x=3}} \right. \\\left \{ {{y=2x} \atop {-x=3}} \right. \\\left \{ {{y=2x} \atop {x=-3}} \right. \\\left \{ {{y=2*(-3)} \atop {x=-3}} \right. \\\left \{ {{y=-6} \atop {x=-3}} \right.$