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Solution


Q.

The locus represented by xy+yz=0 is:
1 a pair of perpendicular lines  
2 a pair of parallel lines  
3 a pair of parallel planes  
4 a pair of perpendicular planes  

Ans.

(4)

Ans.      a pair of perpendicular planes

Explanation:

We have,              xy+yz=0

⇒                                 xy=-yz

So, a pair of perpendicular planes.