Khan/khan-exercises — pull request #7494 by smenks13 (2011-12-01 21:59:54+00:00)
Title: Fix exercise: Slope of a line #7465

The green line wasn't showing up when its slope had a value of positive infinity, so I changed it to a large positive number instead. It's a little hard to see since it coincides with the y-axis, but I guess its ok. Also, let me know if it's not kosher to just change it to a big number like that, and if there's a better solution.