2.3 Region Representing Inequalities in Two Variables


2.3.1 Position of a point relative to the graph of y = ax+ b
1. When y= ax + b, the point is on the line.
2. When y< ax + b, the point is below the line.
3. When y> ax + b, the point is above the line. 


2.3.2 Identifying the region satisfying the respective inequalities.
1.   A dashed line ‘----’ is used when points on the line are not included in the region representing the inequality, such as y > ax + b or y < a or x > a.
2.   A solid line ‘___’ is used when points on the line are not included in the region representing the inequality, such as yax + b or y ≤  a or xa.
3.   The diagrams below show the regions that satisfy the respective inequalities.














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