Khan Academy
Intro to Inequalities
Symbols like < and ≥ and what they mean on a number line.
Watch on YouTubeSolve like equations, then graph every value that works.
Read this first — it covers the idea in plain language with a worked example.
An inequality compares values that are not necessarily equal: < (less than), > (greater than), ≤ (at most), ≥ (at least). "At most 9" means x ≤ 9; "fewer than 5" means x < 5.
Solve an inequality the same way you solve an equation. Then graph the solution on a number line: an open circle for < or >, a closed (filled) circle for ≤ or ≥.
Solve and graph x + 3 < 10
Watch out
If you multiply or divide both sides by a negative number, flip the inequality sign.
Watch the main video, then check the second take if you want another explanation.
Symbols like < and ≥ and what they mean on a number line.
Watch on YouTubeSolve inequality problems the same way you solve equations.
Watch on YouTubeTry a worksheet or work through some problems before the quiz.
A couple of questions to make sure this topic stuck. Retake as many times as you want.
Inequalities & Number Lines
Which inequality represents 'x is at most 9'?