Khan/khan-exercises — pull request #6124 by stchangg (2011-11-11 19:15:03+00:00)
Title: added problem type with 0/undefined slope; refactored out embedded JS

### Trello bug title

* Add problem type to slope of a line exercise

### Changes

* Added problem type with 0/undefined slope
* Refactored out embedded JS in

* Added data-weight=2 to the existing exercises and data-weight=1 to the new one

### Not changed

* Kept the problem options un-randomized, due to referencing by array index within the Hints