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Inequalities demonstrate relationships between two expressions that are not equal to each other. There are four types of inequality symbols: greater than >, less than 4 means x is greater than 4 , so x could be 5, 6, 7, … etc.
Inequalities can be represented on a number line. This gives us a visual representation of the possible values a variable can take. When showing inequalities on a number line, we use two different types of circle. We use an open circle if the inequality does not include an ‘equals to’ and a closed circle if it does. We then use an arrow from the circle or a line between two circles to indicate the possible values the variable can take.
Solving algebraic inequalities such as linear inequalities and quadratic inequalities is very similar to solving algebraic equations, but instead of using an equals sign we use an inequality symbol. As with linear equations, we can have one step inequalities, two step inequalities and unknowns on each side of the inequality. The solution to an inequality represents a range of values rather than one number and the solution set can be represented on a number line.
Given an inequality, we can also write down the possible values a variable can take. We are usually interested in the relevant integer values (whole numbers) it can take. For example, if 3≤x
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