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