Chapter 1.1

Using Variables

VARIABLE- a letter that replaces a number

ALGEBRAIC EXPRESSION-  mathematical phrase that can use numbers, variables & operational symbols (+, -, *, )

** no =**

EXAMPLE:

                 6*X or 6X

QUESTION ONE:    Write an algebraic expression.

A)  8 less than X is....   X-8

B)  4 more than Y is...  Y + 4

Which words belong to which operational symbol?

        ADDITION         SUBTRACTION          MULTIPLICATION             DIVISION        

            * more than       * minus                    *product                           * divided by

        * plus                 * difference              * times                             * quotient

        * in addition to   * subtract                 * multiply by                    * ratio

        * sum                * take away

                                 * less than

EQUATION- algebraic expression with an equal sign

OPEN EQUATION-  contains one or more variables