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1b: Variables and Expressions

1b: Variables and Expressions. Algebraic Expression : a combination of variables, numbers and at least one operation. Variable : a letter or symbol used to represent an unknown variable. 1b: Variables and Expressions. Examples of Algebraic Expressions.

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1b: Variables and Expressions

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  1. 1b: Variables and Expressions • Algebraic Expression: a combination of variables, numbers and at least one operation. • Variable: a letter or symbol used to represent an unknown variable.

  2. 1b: Variables and Expressions • Examples of Algebraic Expressions The letter x is most often used as a variable Means 7 x d Means m x n

  3. 1b: Variables and Expressions • Examples: Translate each phrase into an algebraic expression. • Five inches longer than the length of a book • Two less than the product of a number and eight

  4. 1b: Variables and Expressions • Class work: • Page 3, #1 – 10 all

  5. 1b: Variables and Expressions • Evaluating Expressions: • To evaluate an expression, replace the variable(s) with known values and follow the order of operations. • This is known as substitution.

  6. 1b: Variables and Expressions • Examples: Evaluate each expression if r = 6 and s = 2.

  7. 1b: Variables and Expressions • Class work: Page 4, #1 – 15 odd.

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