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See if you can get full marks in this informative quiz.
Linear Inequalities (F)
Solve GCSE Foundation inequalities. Use number lines, inverse operations, and careful sign flips when multiplying or dividing by negatives to describe solution sets.
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Fascinating Fact:
For DIY planks, length 9 − 3x must be ≥ 0 to fit, so −3x ≥ −9 gives x ≤ 3 after dividing by −3 and flipping the sign.
In GCSE Maths (Foundation), linear inequalities compare values using symbols like <, ≤, >, and ≥. You’ll solve step by step, flip the sign when multiplying or dividing by a negative, and show solutions on number lines.
Key Terms
Inequality: A statement comparing quantities with <, ≤, >, or ≥ instead of equals.
Solution set: All numbers that make the inequality true (often shown on a number line).
Number line: A diagram marking values; open circle for </>, closed circle for ≤/≥ with shading for the range.
Frequently Asked Questions (Click to see answers)
How do you solve a linear inequality step by step?
Use inverse operations as with equations: add/subtract, then multiply/divide. If you multiply or divide by a negative, flip the inequality sign.
When do I reverse the inequality sign?
Reverse the sign only when you multiply or divide both sides by a negative number. For example, −2x > 8 becomes x < −4.
How do I show solutions on a number line?
Use an open circle for < or > and a closed circle for ≤ or ≥, then shade in the direction of the values that satisfy the inequality.