Khan/khan-exercises — pull request #33621 by nathangreenstein (2012-11-14 00:13:23+00:00)
Title: Fraction support for Converting Between Point-Slope and Standard Form

Adds basic support for fractions in the Converting Between Point-Slope and Standard Form exercise.

It could be nice to generalize the fraction parser in the `number` function in answer-types.js and move it into the Math utilities library so it can be called from a custom validation function like this one.