Some ways that an artist could use line to show value would be to hatch which is drawing lines that follow one direction.
You can see that this drawing usses only single direction lines to show value.
Cross hatching is a way to show heavier shading that is used when drawing the darker parts of a shadow and it consists of lines going in multiple directions.
You can see that this drawing uses lines that go in one direction to show value and as those values get darker there are lines going in multiple directions layed over each other.
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