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-x<sub>1</sub>)/a = (y-y<sub>1</sub>)/b = (z-z<sub>1</sub>)/c passes through (x<sub>1</sub>,y<sub>1</sub>,z<sub>1</sub>). 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