Question

{x+y=8
{x-2y=11
помогите пж

Answer 1

$left { {{y=8-x} atop {x-2*(8-x)=11}} right. left { {{y=8-x} atop {x-16+2x=11}} right. left { {{y=8-x} atop {x=11+16}} right. left { {{y=8-x} atop {x=27}} right. left { {{y=8-27} atop {x=27}} right. left { {{y=-21} atop {x=27}} right$