This document discusses linear inequalities and their properties. A linear inequality is any relationship of the form ax + b, where a is not equal to 0. The key points covered include: - Linear inequalities can use the symbols <, >, ≤, or ≥ to represent relationships. - When multiplying or dividing both sides of an inequality by a negative number, the direction of the inequality symbol flips. - Graphing linear inequalities results in solutions represented by regions on a number line. - Compound inequalities involving AND or OR statements can be solved by evaluating each inequality separately and combining the solutions appropriately.