Question

ПОМОГИТЕ ДАЮ 30 БАЛЛОВ {-a-2b=2
{5a+4b=2

Answer 1

$\left \{ {{-a-2b=2}|*2 \atop {5a+4b=2}} \right. \\\\+\left \{ {{-2a-4b=4} \atop {5a+4b=2}} \right.\\------\\ 3a=6\\\\a=2\\\\2b=-a-2=-2-2=-4\\\\b=-2\\\\Otvet:\boxed{(2 \ ; \ -2)}$