[b]Part 1:[/b][list=1][*]Use the polygon tool:[icon]https://tube.geogebra.org/images/ggb/toolbar/mode_polygon.png[/icon] to create a quadrilateral on the coordinate plane below.[br][/*][*]Select one of the vertices of your quadrilateral and show the name of it by selecting the text tool: [icon]/images/ggb/toolbar/mode_showhidelabel.png[/icon] and select "name".  Repeat this process for all of the vertices. *Note: make sure before you select something, you have clicked on the move tool: [icon]/images/ggb/toolbar/mode_move.png[/icon]!![/*][*]Use the reflect about line tool: [icon]/images/ggb/toolbar/mode_mirroratline.png[/icon] by clicking first on the tool, then one of the vertices of the quadrilateral, and finally click on the x-axis.[/*][*]Repeat step 3 for all of the vertices of your quadrilateral.[/*][*]Record the coordinate pair for the original quadrilateral and the image.[/*][/list][b][br]Part 2:[/b][list=1][*]Use the polygon tool:[icon]https://tube.geogebra.org/images/ggb/toolbar/mode_polygon.png[/icon] to create a quadrilateral on the coordinate plane below.[/*][*]Select one of the vertices of your quadrilateral and show the name of it by selecting the text tool: [icon]https://tube.geogebra.org/images/ggb/toolbar/mode_showhidelabel.png[/icon] and select "name".  Repeat this process for all of the vertices. *Note: make sure before you select something, you have clicked on the move tool: [icon]https://tube.geogebra.org/images/ggb/toolbar/mode_move.png[/icon]!![/*][*]Use the reflect about line tool: [icon]https://tube.geogebra.org/images/ggb/toolbar/mode_mirroratline.png[/icon] by clicking first on the tool, then one of the vertices of the quadrilateral, and finally click on the y-axis.[/*][*]Repeat step 3 for all of the vertices of your quadrilateral.[/*][*]Record the coordinate pair for the original quadrilateral and the image.[/*][/list]

[list=1][*]What do you notice happens with the coordinates of the points when you reflect the quadrilateral over the x-axis?[/*][*]What do you notice happens with the coordinates of the points when you reflect the quadrilateral over the y-axis?[/*][/list]