Interactively study line segments

• Drag either of the blue points to adjust the segment.
• The resulting change in the segment depends on the constraint setting:

None

The points may be dragged anywhere,

X

The x coordinate of each point is fixed, so the allowed movement is only up or down,

Y

The y coordinate of each point is fixed, so the allowed movement is only left or right,

X + Y

The point moves only along the line extended from the current segment.

• Clicking and dragging the line itself allows translation of the segment.
• If Triangle is selected, the rise and run are shown in green. The length of the segment is shown on the plot as a decimal and above the plot as an exact value.
• If Extend is selected, the line segment is extended into a line, and its equation is displayed and updated as points are moved.
• Click and hold the chart background to bring up a magnifier.