**HOW TO USE THIS APPLET**

## Constructors Invisible : Grid Invisible

- Drag the intersection location ( • ) to move both lines.
- Drag any other location on either line to rotate the lines about the intersection location.

## Constructors Visible : Grid Invisible

- Drag the intersection location ( • ) to move both lines.
- Drag any other location on either line to rotate the lines about the intersection location.
- Click (and hold down) the mouse button in any triangle to see how the slope value is determined.
- Drag any location along the circle to change the slope determining triangles.
- Drag any intersection location of the circle and lines ( • or • ) to change the slope determining triangles as well as rotate the lines about the intersection location.
- THE CONTROL KEY : Click and drag in the graph area towards or away from the intersection location ( • ) to change the scale. [Try to use "good" scale values (shown in applet when this operation takes place).]

## Constructors Invisible : Grid Visible

- Drag the intersection location ( • ) to move both lines.
- Drag any other location on either line to rotate the lines about the intersection location.
- THE SHIFT KEY : Click and drag in the graph area to move the entire coordinate system.
- THE CONTROL KEY : Click and drag in the graph area towards or away from the origin to change the x and y axis scale. [Try to use "good" scale values (shown in applet when this operation takes place).]

## Constructors Visible : Grid Visible

- Drag the intersection location ( • ) to move both lines.
- Drag any other location on either line to rotate the lines about the intersection location.
- Click (and hold down) the mouse button in any triangle to see how the slope value is determined.
- Drag any location along the circle to change the slope determining triangles.
- Drag any intersection location of the circle and lines ( • or • ) to change the slope determining triangles as well as rotate the lines about the intersection location.
- THE SHIFT KEY : Click and drag in the graph area to move the entire coordinate system.
- THE CONTROL KEY : Click and drag in the graph area towards or away from the origin to change the x and y axis scale. [Try to use "good" scale values (shown in applet when this operation takes place).]

## Other

Use the "RESET" button to restore the applet to the initial state.

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