Khan/khan-exercises — pull request #19215 by rhc2104 (2012-04-12 10:16:05+00:00)
Title: Update point slope and standard form exercise

Change the hints to use mixed fractions instead of decimals whenever possible.

Also reverted to old behavior where x_1 had to be an integer between -5 and 5. This is not ideal, but the most reasonable alternative would be to have an answer type where one answer depends on the other, and tackling that would be a big case of scope creep.