A) a pair of straight lines
B) a pair of parallel lines
C) a pair of perpendicular planes
D) None of the above
Correct Answer: C
Solution :
\[xy+yz=0\Leftrightarrow \,(x+z)\,y=0\Leftrightarrow y=0\] The equations\[y=0\]and\[x+z=0\]represents planes which are at right angles as their altitudes numbers are < 0, 1, 0 > and < 1, 0, 1 > respectively.
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