Ch 1.1 - Variables in Algebra Objective: To recognize and evaluate variable expressions and basic formulas.

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Presentation transcript:

Ch Variables in Algebra Objective: To recognize and evaluate variable expressions and basic formulas.

Definitions Variable A letter that is used to represent a number is known as a variable. For example: In the expression “5x”, x is a variable representing a number that is multiplied by 5

What is a variable? A variable represents an unknown value. 1) 3 + ___ = 10 2) 6 + = 9 3) 8 + x = 12 4) 5 + = 8 These are all variables

Variable Expressions Variable expressions consist of constants, variables, and operations. ExampleMeaningOperation

18 3 2(4 + 5) Evaluate the expression if a = 3, b = 4, and c = 5 1) ab - c 2) 2a(b - c) 3) 4) (3)(4) (3)(4 - 5) 2(3)(-1) -6 2(3) = 8 3 2(9) 3 == 6