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Home > A2C > Chapter 1 > Lesson 1.1.2 > Problem 1-15


Terri's project for the Math Fair was a magnificent black box that she called a function machine. If you put into her machine, the output would be . If you put in , the output would be ; and if you put in 20, it would be 59..  

  1. What would her machine do to the input ? What about ? What about ? Making an input→output table may help you figure this out.

    Look for a pattern. Use the eTool below.

    An input of gives output . Think of a number to multiply the input by.

  2. Write a rule for Terri's machine.

    could be in the table. What is each x-value multiplied by?

    What is the output when ?

    If the input is what is the output? What is the equation?

    Complete the table in the eTool below to help solve the problem.
    Click the link at right for the full version of the eTool:  1-15 HW eTool