From the article that sparked Khan's response: >Take Khan’s explanation of slope, which he defines as “rise over run.” An effective math teacher will point out

From the article that sparked Khan's response: >Take Khan’s explanation of slope, which he defines as “rise over run.” An effective math teacher will point out that “rise over run” isn’t the definition of slope at all but merely a way to calculate it. In fact, slope is a rate that describes how two variables change in relation to one another: how a car’s distance changes over time (miles per additional hour); how the price of an iPod changes as you buy more memory (dollars per additional gigabyte). Followed by this in her response to his letter: >As math was not my subject in school, I don't know who is right but would love to hear from mathematicians out there. I had to reread all 3 articles multiple times. Then I lamented the sad state of journalism as well as the complete willingness of our society to tolerate the "I'm just not good at math so I won't bother to understand it because I don't think it's worthy"-attitude. What angers me about the first article is not that it went by some editor without the editor saying, hey, this seems suspect, but rather the fact that the journalist decided to write about something she had little knowledge about with a tone that suggests that she thinks she knows knows more than Sal or someone else educated on the subject. An unapologetic combination of ignorance and condescension.