Question

РЕШИТЕ ПРОШУ, Я НИЧЕГО НЕ ПОНЯЛА, ВЫРУЧАЙТЕ(((

Answer 1

$frac{0.3}{y + 4} = frac{0.5}{y - 1} \ 0.3(y - 1) = 0.5(y + 4) \ 0.3y - 0.3 = 0.5y + 2 \ 0.3y - 0.5y = 2 + 0.3 \ - 0.2y = 2.3 \ y = 2.3 div ( - 0.2) = frac{23}{10} div ( - frac{2}{10} ) = - frac{23 times 10}{10 times 2} = - frac{23 }{2} = - 11 frac{1}{2} = - 11.5 \ y = - 11.5$