Question

Найдите X и Y пж даю 25 баллов

Answer 1

$\left \{ {{-2(7x-4y)+21x=-26} \atop {\frac{x}{5}+\frac{y}{6}=-\frac{13}{15}}} \right.\\\\\left \{ {{-14x+8y+21x=-26} \atop {\frac{x}{5}*30+\frac{y}{6}*30=-\frac{13}{15}*30}} \right.\\\\-\left \{ {{7x+8y=-26} \atop {6x+5y=-26}} \right.\\ -------\\x+3y=0\\\\x=-3y\\\\6*(-3y)+5y=-26\\\\-18y+5y=-26\\\\-13y=-26\\\\y=2\\\\x=-3*2=-6\\\\Otvet:\boxed{(-6 \ ; \ 2)}$