Question

The locus represented by $xy + yz = 0$ is

• A. a pair of perpendicular lines
• B. a pair of parallel lines
• C. a pair of parallel planes
• D. a pair of perpendicular planes

Answer 1

Answer: (D)

Locus represented by $xy + yz = 0 $
$\Rightarrow $ $y(x + z) = 0$
The planes $y = 0 $ and $x + z = 0 $ are perpendicular