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1b: Variables and Expressions

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

- Examples of Algebraic Expressions

The letter x is most often used as a variable

Means 7 x d

Means m x n

- 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

- Class work:
- Page 3, #1 – 10 all

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

- Examples:
Evaluate each expression if r = 6 and s = 2.

- Class work:
Page 4, #1 – 15 odd.