Webstudy with quizlet and memorize flashcards containing terms like parallel lines, parallel planes, skew lines and more. Webstudy with quizlet and memorize flashcards containing terms like parallel lines have the same slope. , line k has a slope of 2/3. If line m is parallel to line k, then it has a slope of, which of the following pairs of slopes are of perpendicular lines? Webparallel and perpendicular lines unit test quiz for 9th grade students. Find other quizzes for mathematics and more on quizizz for free! Webparallel and perpendicular…