Algebra I : Algebra I By Monica Yuskaitis
Definitions : Definitions Variable – A variable is a letter or symbol that represents a number (unknown quantity).
8 + n = 12
Definitions : Definitions A variable can use any letter of the alphabet.
n + 5
x – 7
w - 25
Definitions : Definitions Algebraic expression – a group of numbers, symbols, and variables that express an operation or a series of operations.
m + 8
r – 3
Definitions : Definitions Evaluate an algebraic expression – To find the value of an algebraic expression by substituting numbers for variables.
m + 8 m = 2 2 + 8 = 10
r – 3 r = 5 5 – 3 = 2
Definitions : Definitions Simplify – Combine like terms and complete all operations
m = 2
m + 8 + m 2 m + 8
(2 x 2) + 8 4 + 8 = 12
Words That Lead to Addition : Words That Lead to Addition Sum
More than
Increased
Plus
Altogether
Words That Lead to Subtraction : Words That Lead to Subtraction Decreased
Less
Difference
Minus
How many more
Write Algebraic Expressions for These Word Phrases : Write Algebraic Expressions for These Word Phrases Ten more than a number
A number decrease by 5
6 less than a number
A number increased by 8
The sum of a number & 9
4 more than a number n + 10 w - 5
x - 6
n + 8
n + 9
y + 4
Write Algebraic Expressions for These Word Phrases : Write Algebraic Expressions for These Word Phrases A number s plus 2
A number decrease by 1
31 less than a number
A number b increased by 7
The sum of a number & 6
9 more than a number s + 2 k - 1
x - 31
b + 7
n + 6
z + 9
Evaluate each algebraic expression when x = 10 : Evaluate each algebraic expression when x = 10 x + 8
x + 49
x + x
x - x
x - 7
42 - x 18 59
20
0
3
32
Complete This Table : Complete This Table 2 7 18 29
Complete This Table : Complete This Table 11 16 27 38
Write an Algebraic Expression for These Situations : Write an Algebraic Expression for These Situations Scott’s brother is 2 years younger than Scott
The sum of two numbers is 12
The difference between two numbers is 5
s - 2 v + c = 12 m – n = 5