3.1 Writing and Graphing Inequalities

Notes

An inequality compares two expressions with $<$, $>$, $\le$ or $\ge$. Its solutions are usually a whole range of numbers.

• "At least" means $\ge$; "at most" or "no more than" means $\le$.
• On a number line, use an open circle for $<$ or $>$ (the endpoint is not included) and a closed circle for $\le$ or $\ge$.
• Shade toward the numbers that make the inequality true.