10/4/2016
Warm – up
Monday
9- 26 - 16
1)
Week 8 & 9 Algebra I
Your friend is thinking of a number. twenty-two, deducted by
twice the number, is the same as the product of three and a number,
increased by 3. What is your friends the number?
Algebra I teachers
Inequality symbols
<
Open Circle
Meaning: less than
Example:
b<4
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10/4/2016
Inequality symbols
≤
Inequality symbols
>
Closed Circle
Open Circle
Meaning: greater than
Meaning: less than or
equal to
Example:
Example:
e≤8
p>5
Inequality symbols
≥
Meaning: greater than or
equal to
Example:
m≥7
Inequality symbols
≠
Closed Circle
Open Circle
Meaning: not equal to
Example:
s≠3
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10/4/2016
Class Notes on Solve and Graphing Inequalities with
a variable.
•The GOLDEN RULE of Inequalities:
• Whenever you MULTIPLY or DIVIDE both
sides of an inequality by a NEGATIVE
NUMBER, you MUST FLIP the inequality
symbol.
Symbols for Open and Closed Inequalities
•Symbols for an open circle
[≠ < > ]
•Symbols for a closed circle
[≤ ≥ = ]
Steps to Solve and graph Inequalities
1)Get the variable by itself on one side of the
inequality symbol.
2)Check the order! (Variable symbol constant)
3)Circle the number on the number line.
4)Open Circle or Closed circle?
5)Shade appropriately
Example: Solve and Graph
5 - 3x ≤ 13 + x
-x
-x
x ≥ -2
5 - 4x ≤ 13
-5
-5
- 4x ≤ 8
- 4 -4
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10/4/2016
Warm – up
Thursday
9-29-16
1. of medicine prescribed for a child
weighing , p, pounds can be found using the
equation g = 4 + 2p
a) How much does the child weigh if she is prescribed
54 grams?
b) What does 2p represent?
a) The dosage per pound of the child.
b) The total of grams taken.
c) The weigh of the medicine.
Classwork
• Pg 288 #1-8
• Pg 295 #2-9
•Put in your
notebook!!
•If you don’t
finish, it’s
homework.
IN YOUR NOTEBOOK!!! ‐
• You will make your own graphs (number lines).
• If you don’t finish, it’s homework!!
• P. 288 #1‐8
• P. 295 #2‐9
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