### 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.

+

and

 

### Practice:

Write an algebraic expression for each phrase.

a.

the sum of

n

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

Write: = the number.

2

y

+ 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)