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Shading Regions Flashcards
GCSE Mathematics (Edexcel) 1MA1
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Inequality symbols
< means 'less than', > means 'greater than', ≤ means 'less than or equal to', ≥ means 'greater than or equal to'.
Shading for y > x
Shade the region above the line y = x.
Shading for y < x
Shade the region below the line y = x.
Shading for y ≥ x
Shade the region above or on the line y = x. Use a solid line to include the boundary.
Shading for y ≤ x
Shade the region below or on the line y = x. Use a solid line to include the boundary.
Dashed line in inequalities
A dashed line is used when the inequality is strict (< or >), meaning the boundary is not included.
Solid line in inequalities
A solid line is used when the inequality is inclusive (≤ or ≥), meaning the boundary is included.
Finding the region for multiple inequalities
Shade the regions for each inequality and identify the overlapping area that satisfies all conditions.
Testing a point in a region
Substitute the coordinates of a point into the inequalities to check if it satisfies all conditions.
Labelling regions
Clearly label the shaded region with 'R' or another identifier to show the solution area.

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