Graphing troubles hp50g


Hi guys, I need to learn to graph stuff like: R={(x,y,z)|y-z<=0} or T={(x,y,z)|xz>=0} on the hp 50G. This is diferent from the typical, y = something, as far as my limited knowledge goes these are inequalities and I don't know how to transform theme to functions. Any help is welcome, thanks.

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