, 2019

Two numbers $x$ and $y$ are such that $x + y = \dfrac{2}{3}$ and $\dfrac{x}{y} = \dfrac{2}{3}$. What is the value of $x - y$?

(A) $-\dfrac{2}{3}$ (B) $-\dfrac{2}{15}$ (C) $\dfrac{2}{25}$ (D) $\dfrac{2}{5}$ (E) $\dfrac{2}{3}$