Mathematics for IGCSE & O level - Inequalities (Section 1 - No. 33)
In a graph of a given inequality, how can you find what side to shade?
Finding the equation of the line
Shading a point on the right-hand side of the line
Using a coordinate point to see what works
Choosing one side to work with
Paliwanag
First finding the line, then you have to substitute a coordinate.