Parallel and Perpendicular Lines in the Coordinate Plane

DIRECTIONS:
In the applet window below,[br][br]1) Construct a line. [br]2) Construct a line parallel to this given line. [br]3) Use the SLOPE tool [icon]/images/ggb/toolbar/mode_slope.png[/icon] to measure and display the slopes of both lines.
4)
Select the MOVE tool again. Move any of the first 2 points you plotted (in step 1) around. What do you notice? [br]
5) Construct a line that is perpendicular to the first line you drew that passes through any other point [br] It doesn't matter where you choose to position this line. [br][br]6) Use the SLOPE tool [icon]https://www.geogebra.org/images/ggb/toolbar/mode_slope.png[/icon] to measure and display the slope of this perpendicular line.
Continued from above...
7) The label for the slope of the first line should be [math]m[/math]. [br] The label for the slope of the perpendicular line should be [math]m_2[/math]. [br] Go to the "Steps" window. In the next input line, type (w/o the " "): "FractionText([i]m[/i])". [br] In the next input line, type (w/o the " "): "FractionText[math]\left(m_2\right)[/math]". [br] If you so choose, you can choose to show these text boxes in the graphics window.
8)
Move any one of the first 2 points you plotted (in step 1) around. What do you notice about the slope of this line and the line perpendicular to it? Explain.
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Information: Parallel and Perpendicular Lines in the Coordinate Plane