What is line in visual arts?

its a path created by a point moving in a space.

one dimensional. lines when made can be different such as horizontal, vertical, straight, curved

including the octave, the answer would 8 notes in a major scale with one note being played twice. ex) c major scale includes: c, d, e, f, g, a, b, c

notice that c is played twice

however, if you were to ask me how many different notes are in a major scale- the answer would be 7.  

answer; ravenna,italy;