ALGEBRA - Variables Notes - VARIABLES Review of Terminology...

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VARIABLES Review of Terminology - An expression is a "phrase" that represents a number. - An equation sets two expressions equal to each other. A variable is a symbol used to represent a number. In the expression 8x + 17, x is the variable. In the equation = 25, y is the variable. Variables need not be letters; for example, the expression 6 + 2 contains the variable . An expression or equation may contain more than one variable. The expression 7 - 3r + 12t contains the variables r and t, and the equation 6y = 24x contains the variables x and y. An algebraic expression is an expression that contains one or more variables. An algebraic equation is an equation that contains one or more variables. Note: When we write two quantities next to each other, or next to each other separated by parenthesis, the multiplication sign is implied. For example, 4r means 4×r and 3(4 + 2) means 3×(4 + 2) . Translating Word Statements into Algebraic Expressions and Equations We can represent word statements by algebraic expressions and equations. For example, "the number of
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