Algebra › Section B · Solving linear equations and inequalities › Topic B.5
Linear inequalities
An equation pins a number down; an inequality frees it to be a whole region of solutions. That freedom is exactly what real problems need — budgets, limits, speed limits and safety margins all speak in inequalities.
In this topic
- One answer versus a whole region
- The four symbols and their graphs
- Interval notation
- Solving with the equation moves
- The flip rule for negatives
- Worked example: solving, graphing and checking
- Translating words into inequalities
- Worked example: a rental budget
- Worked example: the grade she needs
- Common mistakes to avoid
- Key takeaways
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