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
Explication
Shading the region that does not satisfy the inequality can help identify the solution region.