Khan/khan-exercises — pull request #6756 by vijaykramesh (2011-11-20 20:51:21+00:00)
Title: Point slope to standard forms exercise

Completes https://trello.com/card/board/converting-between-point-slope-and-standard-form/4d87e664967a0775082939ab/4ec1860b14720a6bbe611f28