D x 2 x 1 2 y 2 y 1 2. Lines with identical slopes are parallel. Students love this activity because they get to move around the room.
Also they work with a partner which keeps them working and engaged.
Lines with identical slopes are parallel. Distance x 2 x 1 2 y 2 y 1 2. The distance formula is really just the Pythagorean Theorem in disguise. Make a spreadsheet to do it for you.