The answer to yesterday's question is:
A wall cloud (or pedestal cloud). I saw one once in Colorado—see one, and you know why they're called wall clouds. Very ominous looking. The next morning we woke up to the news that the town of Limon had been hit. Hard.
Today's question is:
What is the generic equation for a line written in slope-intercept form? [math teachers, you have to bow out of this one :) ]