Answer: (1,-2,1).
- A (2,3,4)
- B (0,-2,1)
- C (1,-2,1)
- D (-1,2,-1)
Correct answer: C. (1,-2,1)
Explanation: The symmetric form (x-x1)/a = (y-y1)/b = (z-z1)/c passes through (x1,y1,z1). Here the line passes through (1, -2, 1).
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