1. IGCSE Revision Lesson 9 I can represent inequalities graphically I can solve simple linear inequalities ≤ ≥ > <

2. IGCSE Revision Lesson 9 Graphically represent: x > 5x < 4x ≤ 2x ≥ -3 x is more than 5 x is less than 4 x is smaller than x is greater than or equal to 2 or equal to -3 542-3 hollow circle indicates that the number is not included filled circle indicates that the number is included

3. IGCSE Revision Lesson 9 If you double my age, the answer is more than 50. How old am I? If x is my age, form and solve an inequality. Give three integer values that satisfy your inequality.

4. IGCSE Revision Lesson 9 If you triple my age and add 5, the answer is less than 126. Form and solve an inequality. What is the maximum age I could have been at my last birthday?

5. IGCSE Revision Lesson 9 -3x < -6 If you multiply by a negative number, the sign changes round. The best thing is to avoid multiplying by a negative.

6. Two types of question: “Solve the inequality” means “give the complete range” “Write down an integer value” means “give a certain example” (e.g. the largest, smallest...)