Parallel Lines in the Coordinate Plane

DIRECTIONS:
In the applet below, [br][br][table][tr][td]1.[br][/td][td][icon]/images/ggb/toolbar/mode_join.png[/icon][/td][td]Use the [i]line[/i] tool to construct a line. [/td][/tr][tr][td]2.[/td][td][icon]/images/ggb/toolbar/mode_parallel.png[/icon][/td][td]Use the [i]parallel line[/i] tool to construct a line that is parallel to the line you constructed in (1).[/td][/tr][tr][td]3.[/td][td][icon]/images/ggb/toolbar/mode_slope.png[/icon][/td][td]Use the [i]slope[/i] tool to measure and display the slopes of both lines. [/td][/tr][tr][td]4. [/td][td][icon]/images/ggb/toolbar/mode_move.png[/icon][/td][td]Select the [i]move[/i] tool. Move any one (or more) of these points around. [/td][/tr][/table][br][b]Once done, please answer the questions that appear below the applet. [/b]
From what you've observed, what can we conclude about any two (non-vertical) lines drawn in the coordinate plane?
If a line has a slope of zero, then it
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Information: Parallel Lines in the Coordinate Plane