# Algebra I - A number decrease by 5 • 6 less than a number...

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Algebra I By Monica Yuskaitis

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Definitions Variable – A variable is a letter or symbol that represents a number (unknown quantity). 8 + n = 12
Definitions A variable can use any letter of the alphabet. n + 5 x – 7 w - 25

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

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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 Sum More than Increased Plus Altogether

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Words That Lead to Subtraction Decreased Less Difference Minus How many more
Write Algebraic Expressions for These Word Phrases Ten more than a number

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Unformatted text preview: 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 • 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 • x + 8 • x + 49 • x + x • x - x • x - 7 • 42 - x 18 59 20 3 32 Complete This Table n n - 3 5 10 21 32 2 7 18 29 Complete This Table x x + 6 5 10 21 32 11 16 27 38 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...
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Algebra I - A number decrease by 5 • 6 less than a number...

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