You may have used algebra to write equations that represent real-world problem situations. Sometimes, we need to use algebra to describe situations that may call for a range of solutions instead of one particular solution. When that is the case, we can use an inequality to describe the situation instead of an equation.

Consider the number line shown. Remember that on a number line, values increase from left to right.

We use four inequality symbols to represent unequal relationships.

In this lesson, you will learn more about how to use these inequality symbols to represent relationships.