# Dia-axis

## Description

This applet uses two parallel number lines to represent pairs of numbers. The bottom number line shows the first number of a pair and can be moved on the line. The upper line shows the second number of the pair, . An arrow connects the two values.

## Activities

The pair of values are related by an equation. Can you tell what the equation is by moving the x value? Selecting the Show Relation button will show the equation that relates the y value to the x value. Clicking the next button will use a different relation.
Can you think of a better way to show pairs of values so that the relation between the values can be more easily seen?

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