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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
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 expressions1
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


1b variables and expressions2
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


1b variables and expressions3
1b: Variables and Expressions

  • Class work:

    • Page 3, #1 – 10 all


1b variables and expressions4
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.


1b variables and expressions5
1b: Variables and Expressions

  • Examples:

    Evaluate each expression if r = 6 and s = 2.


1b variables and expressions6
1b: Variables and Expressions

  • Class work:

    Page 4, #1 – 15 odd.


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