第85页

信息发布者:
B
B
A
解:
(1) 由题意知,$2x + y = 10,$$\therefore y = -2x + 10$
(2) $\because \begin{cases}2x > y \\ y > 0\end{cases},$
$\therefore \begin{cases}2x > -2x + 10 \\ -2x + 10 > 0\end{cases},$
解得$2.5 < x < 5。$$\therefore x$的取值范围是$2.5 < x < 5$
A