In general terms, linear refers to everything that belongs to the line, that presents its shape or that is linked in some way to it. Meanwhile, by line refers to that continuous succession of infinite points.
The word linear is also used to designate that drawing with segments of geometric lines generally made using utensils, such as the ruler, the square and the compass.
Also and continuing in this sense, the perspective in which objects are presented by the lines of their contours is called linear.
On the other hand, when you want to realize that something presents a constant development or in the same direction, such as the speed of a vehicle traveling on the road.
Meanwhile, the linear term is linked to other widely spread concepts.
A lineal funtion, for example, is one of them and it refers to the set of operations that are carried out on an element of a vector subspace to transform it into an element of another subspace. Working with vectors turns out to be very simple and they are easy to interpret within a graphic context.
On the other hand, it is also recurrent to hear about the linear function in geometry and at the behest of mathematical calculus when you want to refer to a line, a plane, or a general linear manifoldHowever, it is worth noting that in this sense, the concept is used erroneously, although it enjoys use.
