Speed Limits Are Inequalities

A speed limit sign does not say "drive at exactly 65 mph" — it says v ≤ 65 mph. The solution is not one number but a whole range: any speed from 0 to 65. Most real-world rules work this way.

A nutritionist's advice: at least 50g of protein daily (p ≥ 50). A budget: spending must not exceed income (S ≤ I). An engineer's safety margin: bridge load must stay below 80% of capacity (L < 0.8 × L_max). Each one defines a feasible region — the set of all valid solutions.