Khan/khan-exercises — pull request #10448 by rhc2104 (2012-01-05 18:49:56+00:00)
Title: Converting between point slope and slope intercept form

Trello task: https://trello.com/card/board/converting-between-point-slope-and-slope-intercept-form/4d87e664967a0775082939ab/4ec1866014720a6bbe61374f

Finish off the progress from this pull request: https://github.com/Khan/khan-exercises/pull/6756

Related video: http://www.khanacademy.org/video/point-slope-and-standard-form?playlist=Algebra+I+Worked+Examples