helllp

http://data.artofproblemsolving.com/...aa8dcecd4e.png

The points described are points with either $\displaystyle y = 2x$ or $\displaystyle x = 2y$. Let's solve for $\displaystyle y$ in the second equation: $\displaystyle y = \dfrac{1}{2}x$. Graph these two equations and see what you wind up with.