Linear Function Graph
How to Use this Applet
Definitions
 <SHIFT>+drag: Hold down the <SHIFT> key, then drag the described object.
 <CTRL>+drag: Hold down the <CTRL> key, then drag the described object.
 <CTRL>+<SHIFT>+drag: Hold down both the <CTRL> key and the <SHIFT> key, then drag the described object.
The Slider Area
The sliders change the parameters m and b in the linear relation y = mx + b; the parameters m, x_{1} and y_{1} in the linear relation y − y_{1} = m( x − x_{1} ) and the parameters a, b and c in the the linear relation ax + by + c = 0.
 Drag the slider thumb to change the value of a parameter. Use the <UP> and <DOWN> arrow keys to increase or decrease the selected parameter. (Use the keys for fine adjustments.)
 NOTE: If a key doesn't respond:

 position the cursor in the applet frame
 click the mouse button
 try the key again.
 Use the <LEFT> and <RIGHT> arrow keys to change the selected parameter. The selected parameter will have light blue slider gutters.
 Drag a slider scale to change the range of the scale while maintaining the scale length.
 Drag a location in a slider gutter towards or away from the thumb to change both the range of the scale and the scale length.
 Select the corresponding parameter button to enter a value for a parameter.
The Graph Area (General Functions)
 <SHIFT>+drag in the graph area to move the entire coordinate system.
 <CTRL>+drag in the graph area, towards or away from the origin, to change the x and y axis scale.
The Graph Area [y = mx + b and y − y_{1} = m( x − x_{1})]
 Drag the "dot" to move the line.
 Drag a location along the line other than the "dot" to change the slope of the line.
The Graph Area [ax + by + c = 0]
 In ax + by + c = 0 form, the line can only be adjusted by changing the parameters.
Other
 Select the MOVE ORIGIN button, then drag in the graph area to move the entire coordinate system.
 Select the CHANGE SCALES button, then drag in the graph area (towards or away from the origin) to expand or compress the scales on each axis.
 Select the PRECISION button to set number rounding.
 Select the TRACE x→y button to predict a yvalue from a given xvalue, based on the horizontal position of the cursor.
 Select the TRACE x←y button to predict an xvalue from a given yvalue, based on the vertical position of the cursor.
 Select the TRACE x↔y button to predict both a yvalue from a given xvalue, based on the horizontal position of the cursor, and to predict an xvalue from a given yvalue, based on the vertical position of the cursor.
 Select the RESET button to restore the applet to the initial state.
