0.9 Linear inequalities in two variables
Unit 0 · Textbook foundations: equations, lines and systems
Ideas in this lesson
Boundary and shading
Strict inequalities exclude the boundary; compare the output to decide the half-plane.
Check a point in a half-plane
Substitute both coordinates into the stated inequality.
Feasibility for a system
A feasible point satisfies every constraint at the same time.
Represent contextual constraints
Include the budget, minimum quantity, nonnegativity and whole-item restrictions.
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