[size=150][b][url=https://www.geogebra.org/m/xjbkunq7]Exploring Parallel Lines in the Coordinate Plane[/url][/b][br][br][b][url=https://www.geogebra.org/m/hh6rzn7h]Exploring Perpendicular Lines in the Coordinate Plane[/url][/b][/size]