
There are two types (or levels) of linear equation available for you to explore: y = ax and y = ax + b. You
choose between them by tapping or .
The keys available to you to manipulate the graph or equation depend on the level you have chosen. For
example, the screen for a level 1 equation shows this:
←→ +– +/–
This means that you can press , , , , and . If you choose a level 2 equation,
the screen shows this:
←→ ↑↓+– +/–
This means that you can press , , , , , , and .
Graph mode
The app opens in graph mode (indicated by the dot on the Graph button at the bottom of the screen). In graph
mode, the and keys translate the graph vertically, eectively changing the y-intercept of the
line. Tap to change the magnitude of the increment for vertical translations. The and keys (as
well as
and ) decrease and increase the slope. Press to change the sign of the slope.
The form of the linear function is shown at the top right of the display, with the current equation that matches
the graph just below it. As you manipulate the graph, the equation updates to reect the changes.
Equation mode
Tap to enter equation mode. A dot will appear on the Eq button at the bottom of the screen.
338 Chapter 21 The Explorer apps
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