How is the locus of 2 lines described?

The correct choice indicates that the locus of two lines is described as a line that is equidistant from both lines. This situation arises when you consider two parallel lines. The locus of points that are equidistant from both lines forms another line that runs parallel to them, at a constant distance on both sides.

In the case of non-parallel lines, the concept of locus can vary, but generally focuses on lines that maintain a specific geometric relationship to two others. The notion of distance applies, often conceptualizing this as the locus of points that maintain an equal distance from both lines as you move perpendicularly away from them. Understanding this concept is fundamental in geometry, especially in coordinate systems, as it relates to how lines and their properties interact in a plane.