In basic mathematics, a linear function is a function whose graph is a straight line in 2-dimensions (2D, see images).[1] An example is: y=2x–1. In higher mathematics, a linear function often refers to a linear mapping.[2][3]
↑Gelfand, I.M.; Glagoleva, E.G.; Shnol, E.E. (1990). Functions and Graphs. Dover Publications. p. 22. ISBN978-0-486-31713-7. (in English)