1. How do you model relationships with variables and equations?
Section 1-1
How do you model relationships with variables and equations?

2. Vocabulary Variable- Algebraic Expression-
a symbol, usually a letter, that represents one or more numbers
a mathematical phrase that can include numbers, variables, and operation symbols.

3. Vocab cont. a mathematical sentence that uses an equal sign Equation-
Open Sentence-
an equation that contains one or more variables

4. Examples Write an algebraic expression for each phrase:
Seven more than n
The quotient of n and 9
7 less than twice a number n

5. Examples
iTunes sells albums for $9.95 each. Write an equation that best represents the cost (c) of a given number (n) of albums?