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I will guess that what you refer to as a "shadow graph" serves as a way to visually represent all the answers, or solutions, to a linear inequality. For instance, if you graph y=x (a linear equality), you get the diagonal line through the origin heading 45 degrees up and to the right in one direction and down and to the left in the other. Any point on that line is a solution, even extended beyond the visible graph in both directions, "forever". However, if you graph y
bar graph, double bar graph, line graph, and picto graph
Pie graph, column graph , tally graph, Histogram
Circle Graph Bar Graph Line Graph Histogram Picture Graph
a line graph is over time. a bar graph is not