Edexcel IGCSE Maths 復習筆記 2.16.1 Solving Inequalities - Linear
Edexcel IGCSE Maths 復習筆記 2.16.1 Solving Inequalities - Linear
What is a linear inequality?
- An?Inequality?tells you that one expression is greater than (“>”) or less than (“<”) another
- “?” means “greater than or equal to”
- “?” means “less than or equal to”
- A?Linear Inequality?just has an?x?(and/or a?y) etc in it and no?x2?or similar
- For example, 3x + 4 ? 7 would be read “3x + 4 is greater than or equal to 7”
Solving linear inequalities
- Solving linear inequalities is just like?Solving Linear Equations?(so review these notes first)
- You also need to know how to use?Number Lines?and deal with?“Double” Inequalities
1. Same rules as solving equations:?GROF GROBLET FIND ANSWER!
But do?NOT?multiply (or divide) by negative numbers
2. When drawing?NUMBER LINES:
3. For “double” inequalities just do the same thing to all three parts
Worked Example
轉載自savemyexam
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