If this is related to coordinate geometry then the shading refers to
the areas on the graph that satisfy the given inequations
i.e if y>=2x+3
and y>= -2x+3
then the areas above both lines would be shaded.
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If the graph is a two-dimensional plane and you are graphing an inequality, the "greater than or equal to" part will be shown by two things: (1) a solid, not a dotted, line--this part signifies the "or equal to" option--and (2) which region you shade. Shade the region that contains the points that make the inequality true. By shading that region, you are demonstrating the "greater than" part.
If all the vertices and edges of a graph A are in graph B then graph A is a sub graph of B.
the parent graph of a graph
You can graph an equation or an inequality but you cannot graph an expression.
This graph fails the vertical line test at x = 3This graph is not the graph of a function.