#### Transcript Section 1-1: Variables and Expressions

```PICK-UP AUTOMATICITY
FOLDERS AND SHEET A3
BEFORE HAVING A
SEAT!!!!
Section 1-1: Variables and
Expressions
PEARSON
COMMON CORE
ALGEBRA I
I am learning to…
 Write algebraic expressions.
Vocabulary
 Quantity- anything that can be measured or counted.
 Variable- symbol, usually a letter, that represents the
value(s) of a variable quantity.
 Algebraic Expression-mathematical phrase that
includes one or more variables.
 Numerical Expression- a mathematical phrase
involving numbers and operation symbols, but no
variables.
Expressions
Operation
Key Words
Subtraction
Less, difference, minus
Multiplication
Per, times, product
Division
Quotient, ratio
sum, more
Example 1: Writing Expressions with Addition
and Subtraction
 The difference of m and 6
 6 less than n
 15 more than m
Example 2: Writing Expressions with
Multiplication and Division
 The product of 7 and a number n
 9 times a number m
 The quotient of a number x and 7
Example 3: Writing Expressions with Two
Operations
 8 more than three times a number n
 The product of 7 and the sum of a number n and 8
 7 less than the product of 8 and a number y
Example 4: Using Words for an Expression
 K+6
 5x + 8
 9x - 8
Example 5: Writing a Rule to Describe a Pattern
 A state park charges an entrance fee plus \$18 for
each night of camping. The table shows this
relationship. What algebraic expression describes the
total cost of camping n nights?
Nights
1
2
3
n
Total Cost
(\$18 x 1) + \$20
(\$18 x 2) + \$20
(\$18 x 3) + \$20
?
Homework
 Exit Slip: Write an algebraic expression for the
following word phrase: 17 less than h
 Page 7 #’s 10-32 even
```