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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

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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

The letter x is most often used as a variable

Means 7 x d

Means m x n

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 Expressions

• Class work:

• Page 3, #1 – 10 all

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 Expressions

• Examples:

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

1b: Variables and Expressions

• Class work:

Page 4, #1 – 15 odd.