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The image contains a multiple-choice question in Russian, asking how a straight line can be defined in space. Here’s the translation of the options:

**Question**: How can a straight line be defined in space?

1. A point on the line and a directing vector.
2. Two points that belong to the line.
3. A point on the line and the plane to which the line belongs.
4. A point on the line and a normal vector to it.

### Correct Answer:
The second option, **"Two points that belong to the line"**, is the most standard and universally correct way to define a straight line in space. A line is fully determined if two distinct points are known.

Would you like to go into more detail or ask any questions?

Here are 5 related questions to expand your understanding:
1. How can we define a plane in 3D space using points and vectors?
2. What is the equation of a line in 3D space?
3. Can a line in space be uniquely defined by a point and a vector? If yes, how?
4. How does the concept of direction vectors help define lines?
5. What is the difference between a normal vector and a direction vector?

**Tip**: A line can also be defined parametrically in space using a point and a direction vector!

Прямую в пространстве можно зафиксировать, задав: точку, принадлежащую ей, и направляющий вектор; две точки, принадлежащие ей; точку, принадлежащую ей, и плоскость, которой принадлежит прямая; точку, принадлежащую ей, и нормальный вектор к ней.

Understand how to define a straight line in 3D space. This problem explores different ways to describe a line using points, vectors, and planes. Learn about the two-point form and the use of directing vectors.

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