Question

daca x+y supra x-y= 5supra4 atunci afla valoare raportului ysupra x.​

Answer 1

$\dfrac{x+y}{x-y} = \dfrac{5}{4}\\\\ \\ \Rightarrow 4(x+y) = 5(x-y) \\ \\ \Rightarrow 4x+4y = 5x-5y \\ \\ \Rightarrow 5x-4x = 4y+5y \\ \\ \Rightarrow x = 9y\\ \\ \Rightarrow \boxed{\dfrac{y}{x} = \dfrac{1}{9}}$