Mathematics for IGCSE & O level - Inequalities (Section 1 - No. 36)
If we are to shade regions that don't satisfy the inequality, what does the graph show?
The region is shaded correctly.
The non-shaded region is what satisfies the inequality.
It often easier to shade the region that isn't satisfied.
The line representing is still the boundary
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Shading the region that does not satisfy the inequality can help identify the solution region.