HOW TO USE THIS APPLET

The slider area

The sliders change the parameters m and b in the linear relation y = mx + b; the parameters m, x₁ and y₁ in the linear relation y - y₁ = m( x - x₁ ) and the parameters a, b and c in the the linear relation ax + by + c = 0.

• Drag a slider to change the value of a parameter.
• The left and right arrow keys can be used to change the selected parameter [light blue].
• The up and down arrow keys can be used to increase or decrease the selected parameter. (Use this feature for fine adjustments.)
• If the arrow keys don't respond, click the cursor in the applet frame then try again.
• Drag a parameter scale to "move" it. (ie. Change the range but maintain the scale "length".)
• Drag towards or away from a parameter thumb to "re-scale" the scale.
• Select the corresponding parameter button to enter a value for a parameter.

The graph area [y = mx + b and y - y₁ = m( x - x₁)]

• In ax + by + c = 0 form, the line can only be changed by changing the parameters.
• 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

• Use the "RESET" button to restore the applet to the initial state.
• THE SHIFT KEY : Drag in the graph area to move the entire coordinate system.
• THE CONTROL KEY : Drag in the graph area towards or away from the origin to change the scale.

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