9-5 Inequalities in Two-Variables

9P6: Use inequalities

• Inequalities

• 1. Graph using Slope (m) and y intercept (b)• 2. Decide if line is solid ( ≥ or ≤ )

or dashed ( > or < )

• 3. Shade ALL Solutions ( > or ≥ ) Above line

• ( < or ≤ ) Below Line•

• Example 1:

• y < 2x -1

• Example 2:

• y ≥ - x + 2

• Example 3:

• x < 3

• Example 4:

• 4 ≤ 2x + y

To write an inequality for a graph

Start with

y mx +b

Fill in alligator (inequality)

and m and b

• Example 7:Doritos cost $3.00 a bag and 2 Liters cost $1.00. If you are

having a party and don’t want to spend more than $20, How many of each can you buy?

Assignment

• Day 1: WS

• Day 2: 9-5/419-420/4-32 m4,34-39,46-53