Answer: r = a + lambda*b.
- A r = b + lambda*a
- B r = a + lambda*b
- C r = lambda*(a + b)
- D r = a*b
Correct answer: B. r = a + lambda*b
Explanation: Vector form of a line: r = a + lambda*b, where a is the position vector of a point on the line and b is the direction vector.
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