How to define solution region?

[YangtuchXo]

What are the methods and considerations involved in determining the points that define the solution region to a system of inequalities, encompassing both horizontal and vertical constraints?

[janusz55]

Methods for solving a system of inequalities include:
- the graphical method,
- the method of reduction to a system of equations, with additional assumptions on the free variables also called the method of base variables.
- various versions of the Simplex method.

[EsafaliTakru]

Here's how to find the solution region for a system of inequalities with both horizontal and vertical constraints:

Methods:

Graphing: This is the most common method.

Plot each inequality individually.
For horizontal inequalities (y ≤ a or y ≥ a), shade the region above or below the line y = a, depending on the inequality.
For vertical inequalities (x ≤ b or x ≥ b), shade the region to the left or right of the line x = b, depending on the inequality.
The solution region is the area where the shading for all inequalities overlaps.
Test Points: Choose a point in the graph and check if it satisfies all the inequalities. If a point satisfies all inequalities, it lies within the solution region.

Linear Programming (advanced): Use software or mathematical techniques to find the corner points of the feasible region. These points define the boundaries of the solution region.

Considerations:

Pay attention to the strict inequalities ( < or > ) vs. non-strict inequalities ( ≤ or ≥ ). Shading changes depending on the strictness.
Double-check your inequalities. Make sure you're shading the correct regions based on the symbols ( < , > , ≤ , ≥ ).
Consider the intersection of multiple inequalities. The solution region is where all the individual inequalities' shaded areas overlap.

[YangtuchXo]

This same thought has been applied to the coast of Britain. It was measured by a few people and they kept getting different results, by far. One man realized if you were to measure around each rock, each grain of sand on the coast the distance reaches towards infinity.

[janusz55]

In companies of different sectors . The use of methods and tools of linear programming -methods of operational research in engineering and managerial practice can effectively support decision-making processes.