Answer:

A system of linear inequalities is often used to determine the best solution to a problem. This solution could be as simple as determining how many of a product should be produced to maximize a profit or as complicated as determining the correct combination of drugs to give a patient.

Other uses are:

-Age problems.

-Speed, time and distance problems.

-Geometry problems.

-Money and percentage of problems.

-Wages and hourly rate problems.

-Force and pressure problems.

Ref.

www,ck12,org

(You can get more realistic uses here)