Definitions

• Shift-drag: Hold down the shift key, then drag the described object.
• Control-drag: Hold down the control key, then drag the described object.
• Control-shift-drag: Hold down both the control key and the shift key, then drag the described object.

Control and Keyboard Functions

• Select the LINE ONE button then either the y = mx + b button or the ax + by = c button to make changes in line one.
• Select the LINE TWO button then either the y = mx + b button or the ax + by = c button to make changes in line two.
• Use the slider controls to change the following parameters:
  • m and b in the linear relation y = mx + b.
  • a, b and c in the the linear relation ax + by = c.
• 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.
• Select the PRECISION button to set number rounding.
• Select the TRACE button to predict:
  • a y-value given an x-value, based on the horizontal position of the cursor in the coordinate plane.
  • an x-value given a y-value, based on the vertical position of the cursor in the coordinate plane.
• Select the RESET button to restore the applet to the initial state.

Graph area functions for y = mx + b

• Drag the dot to move the line.
• Drag a location along the line other than the dot to change the slope of the line.

Graph area functions for ax + by = c

• Adjust the line by changing the parameters. There are no methods available to adjust the graph in the graph area.

General graph area functions

• Shift-drag in the graph area to move the entire coordinate system.
• Control-drag in the graph area, towards or away from the origin, to change the x and y axis scale.
• Control-shift-drag in the graph area, towards or away from:
  • the x-axis, to change the y-axis scale.
  • the y-axis, to change the x-axis scale.

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