Question

Помогите решить номер 4 ! Осень надо ,срочно

Answer 1

$frac{3.8-y}{5.5} = frac{3.6-y}{11} \ frac{3.8-y}{5.5} - frac{3.6-y}{11}=0 \ frac{10(3.8-y)-5(3.6-y)}{55}=0$
$frac{38-10y-18+5y}{55}=0 \ frac{20-5y}{55}=0 \ 20-5y=0 \ 5y=20 \ y=20:5 \ y=4$

Answer 2

$frac{3.8-y}{5.5} = frac{3.6-y}{11} /*55 \ \ frac{55*(3.8-y)}{5.5} = frac{55*(3.6-y)}{11} \ \ 10(3.8-y)=5(3.6-y) \ 38-10y=18-5y \ -10y+5y=18-38 \ -5y=-20 \ y=-20:(-5) \ y=4$