Answer: (2,-1,3).
- A (1,2,3)
- B (3,2,1)
- C (2,-1,3)
- D (1,-2,3)
Correct answer: C. (2,-1,3)
Explanation: A line perpendicular to plane ax+by+cz=d has direction ratios (a,b,c). So direction ratios are (2,-1,3).
Three mutually perpendicular axes x, y, z meeting at the origin O, with a point P located by its (x, y, z) coordinates.
Concept context
Lines and planes in 3D space, direction cosines, distances, and angles