# Two Number Lines #9

- Author:
- David Cox

**Move Point X. What do you notice?**

**Prediction**If

**X**is -5, what is

**Y**? If

**X**is 2.3, what is

**Y**? If

**X**is 237, what is

**Y**?

**Verbal Description**Describe how you can find

**Y**if you know what

**X**is. Describe what you notice about the sketch that the point

**(x, y)**makes when you turn on the trace.

**Look for Number Patterns**Make a table for

**X**and

**Y**and include at least five different pairs for A and B. What do you notice?

**Rule**Write a rule for finding

**Y**if you know

**X**. Your rule should begin with

**"Y =**..."