Information about Algebra I 1

A variable is a letter or symbol that represents a number (unknown quantity).

8 + n = 12

A variable can use any letter of the alphabet. n + 5 x – 7 w - 25

A variable can use any letter of the alphabet.

n + 5

x – 7

w - 25

Algebraic expression is a group of numbers, symbols, and variables that express an operation or a series of operations. m + 8 r – 3

Algebraic expression is a group of numbers, symbols, and variables that express an operation or a series of operations.

m + 8

r – 3

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

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

Sum More than Increased Plus Altogether

Sum

More than

Increased

Plus

Altogether

Decreased Less Difference Minus How many more

Decreased

Less

Difference

Minus

How many more

Ten more than a number A number decreased 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

Ten more than a number

A number decreased by 5

6 less than a number

A number increased by 8

The sum of a number & 9

4 more than a number

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

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

x + 8 x + 49 x + x x - x x - 7 42 - x 18 59 20 0 3 32

x + 8

x + 49

x + x

x - x

x - 7

42 - x

2 7 18 29 n n - 3 5 10 21 32

11 16 27 38 x x + 6 5 10 21 32

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

Scott’s brother is 2 years younger than Scott

The sum of two numbers is 12

The difference between two numbers is 5

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