Using the app

Use sliders and movable points in the graph canvas

Turn letters into sliders to see how a graph changes, play them as an animation, and drag points around.

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Sliders make it easy to see what each number in an equation does, for example how m and b change the line y = mx + b.

1. Type an equation with letters you have not defined yet, such as y = mx + b. A message says "Define m, b." with buttons under it.
2. Tap a letter button to add a slider for it, or tap all to add every slider at once.
3. Drag a slider and watch the graph change. The line above the slider updates to the new value, for example m = 2.5.
4. Tap the number at either end of a slider to change its smallest value, largest value and step.
5. Tap the play button next to a slider to animate it back and forth. Tap it again to stop.
6. To make a point you can drag, use slider letters for its coordinates: type (a, b) with sliders for a and b. Big dots on the graph can be dragged, and the sliders follow.
7. A point like (a, f(a)) moves along the curve of f when you drag it.

Tips

• You can also type a value yourself, for example a = 3, and a slider appears.
• Definitions can be in any order: a line may use a slider defined below it.

Related guides

• Graph equations by typing them (graph canvas)Open the graph canvas, type equations the way they are written in your textbook, and watch them drawn as you type.
• Find intercepts, highs and lows, and intersections on the graph canvasTap a curve to see its intercepts, maximum and minimum points and where it crosses other lines; trace along it and zoom.