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Questions  

The locus represented by xy+yz=0 is

a
A pair of perpendicular lines
b
A pair of paralle lines
c
A pair of parallel planes
d
A pair of perpendicular planes

detailed solution

Correct option is D

y(x+z)=0y=0 (xz-plane)x+z=0 (plane parallel to y-axis)a1a2+b1b2+c1c2=0

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