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Variables and Expressions

This guide introduces the concepts of variables and algebraic expressions, essential for understanding algebra. A variable is a symbol representing an unknown value, while an expression combines numbers and variables using arithmetic operations. Learn how to express mathematical relationships, such as sums and quotients, and how to evaluate them using specific values. This resource also emphasizes the importance of proper notation, including using parentheses and following the order of operations (PEMDAS). Discover examples and tips to enhance your understanding of these fundamental concepts.

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Variables and Expressions

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  1. By Mr. Chancellor Variables and Expressions

  2. A variable is used to represent an unknown number or value. An algebraic expression combines numbers and variables with arithmetic operations. Variables and Expressions

  3. Sum Plus More than Add In all Increase by total Variables and Expressions +

  4. Difference Less than Subtract Minus Decrease by Variables and Expressions -

  5. Times multiply Each Product Of X Variables and Expressions • Quotient • Divided

  6. Write a variable expression for each: • 17 more than y • The quotient of 45 and N Variables and Expressions

  7. Evaluate if X = 7 and X=2 3X + Y X – Y 2 Variables and Expressions

  8. Write an algebraic expression for: “Eight less than the sum of the numbers m and n” Variables and Expressions

  9. Tips!!! Use parenthesis or raised “ .” for multiplying not “ X .“ Don’t forget the Order of Operations (PEMDAS) Variables and Expressions

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