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Q. The equation $ xy = 0 $ in $ 3D $ space represents

J & K CETJ & K CET 2017Three Dimensional Geometry

Solution:

$xy=0 \, \Rightarrow $ either $x=0$ i.e., yz-plane or $y=0$, i.e., $xz$-xz-plane which represents a pair of planes at right angles