Very quick, basic question about Graphing

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so I'm graphing tetrahedron bounded by a given plane and "The coordinate planes"

what is meant by "the coordinate planes"? i can graph the plane but i need help here
 
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The xy plane, the xz plane, and the yz plane. (in r3). Like saying "bounded by the x and y axis" in r2.
 
ah ok, thank you!
 
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