How to enter the room:
1.
2.
3.
4.
5.
Greet Mrs. King at the door. A good
class begins with mutual respect and
recognition.
Retrieve a copy of the notes from the
materials table.
Open your binder to the first section
Write today’s date at the top (9/10/2014)
Prepare to take notes
Using Variables
Algebra A
Unit 1, Lesson 1
Definition
Variable: a symbol, usually a letter, that
represents one or more numbers.
Definition
Algebraic expression: a mathematical phrase
that can include numbers, variables, and
operation symbols.
Operation Words and Phrases
+

and
-

Practice:
Write an algebraic expression for each phrase.
a. the sum of n and 8
“Sum” means addition.
n+8
b. six less than b
“Less than” means subtraction.
CAREFUL of the order here!
b – 6.
Practice:
Define a variable and write an algebraic expression for
each phrase.
a. “ten more than twice a number.”
Define: Let y = the number.
Write: 2y + 10
b. “three times a number minus six.”
Define: Let n = the number.
Write:
3n – 6
Definition
Equation: a mathematical sentence that uses an
equal sign.
What word or words
from a sentence
would indicate an
equal sign?
Practice:
Write each sentence as an algebraic equation.
1. A number increased by nine is fifteen.
2.
Twice a number is eighteen.
3.
Four less than a number is twenty.
Practice:
Write each sentence as an algebraic equation.
1.
Twice a number, decreased by twenty-nine, is seven.
2.
Thirty-two is twice a number increased by eight.
3.
The quotient of fifty and five more than a number is ten.
At the end of the lesson:
1.
2.
3.
Make sure your notes are secured in
your binder in the notes section and in
order.
Pay attention for any special
instructions regarding the homework.
Write your name and the date on the
worksheet as soon as you receive a
copy.
Homework
Practice 1-1 worksheet
#1-20 (front and back of the worksheet)