https://padlet.com/jlrich/q8tey2yx2zha Parallel and perpendicular lines en-us 2017-05-12 04:05:45 UTC 2017-09-29 20:10:54 UTC hello@padlet.com jlrich https://padlet.com/jlrich/q8tey2yx2zha/wish/171498917 What happens mathematically that makes two equations perpendicular to each other? ]]> 2017-05-12 14:27:56 UTC https://padlet.com/jlrich/q8tey2yx2zha/wish/171498917