# Parallel Lines in the Coordinate Plane: Quick Exploration

- Author:
- Penny Cornwell, GeoGebra Team

## DIRECTIONS:

In the applet below,

1. | | Use the line tool to construct a line. |

2. | | Use the parallel line tool to construct a line that is parallel to the line you constructed in (1). |

3. | | Use the slope tool to measures and display the slopes of both lines. |

4. | | Select the move tool. Move any one (or more) of these points around. |

**Once done, please answer the questions that appear below the applet.**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