1. Solving Inequalities Using Addition and Subtraction

2. Definitions The solution of an inequality is the set of numbers that make it true. There are four signs:

3. Key Words < less than, fewer than, below > greater than, more than, above, exceeding ≤ less than or equal to, at most, not above ≥ no less than, at least, no fewer than

4. Let’s look at a couple True or false (hands up for true, no hands for false) :

5. Ex. 1

6. Now we graph it > and < are open circles are closed circles

7. x > -4

8. In your notes

9. Again

10. Ex 2 To get an A in class, Jack needs at least 1000 points. He has already earned 360 points. How many more points does he need for an A?

11. Closure Working with a partner, write and solve an inequality: Mark is saving up for an xbox. It costs $360 and he has already saved up $100. How much more does he need?