Question

Номер 3 спомощью подстановки плиз решите пожалуста

Answer 1

$left { {{frac{5x}{2}+frac{y}{5}=-4; |cdot 10} atop {frac{x}{3}-frac{y}{6}=frac{1}{6}; |cdot 6}} right. ; ; left { {{25x+2y=-40} atop {2x-y=1}} right. ; ; left { {{25x+2(2x-1)=-40} atop {y=2x-1}} right. \\\ left { {{25x+4x-2=-40} atop {y=2x-1}} right. ; ; left { {{29x=-38} atop {y=2x-1}} right. ; ,; left { {{x=-frac{38}{29}} atop {y=-frac{76}{29}-1}} right. ; left { {{x=-frac{38}{29}} atop {y=-frac{105}{29}} right.$

$Otvet:; ; (-1frac{9}{29}; ;-3frac{18}{29}); .$