why is value different than line?

Specifically LINE describe and EDGE

VALUE describes a SURFACE

when a surface turns it creates an edge.

the edge can be described by a change in value - which creates a kind of line!

A line is created where the two edges of the colors meet.

Edges are created where the surfaces end.

Tomorrow we start a new section on value. Please make sure you have your line drawings finished and posted so you can begin on the next group of assignments.
Again, make sure your line drawings meet the requirements for the assignment.
use only lines
have clear spaces using over lap, value and relative size
use the whole page -- i.e. finished
see rubric for how it will be graded.
also make sure you are following the grading format.