Question

The equation $xy = 0$ in three-dimensional space represents:

• A. A pair of straight lines
• B. A plane
• C. A pair of planes at right angles
• D. A pair of parallel planes

Answer 1

The Correct Option is C

The equation $xy = 0$ implies either $x = 0$ or $y = 0$. These represent the $yz$-plane and $xz$-plane, which are perpendicular to each other.