Khan/khan-exercises — Issue #15580: Algebra challenge - Wrong inverse.
Author: KhanBugz
Created: 2012-03-06 20:52:30+00:00
State: open
Labels: chrome, win7, wrong-or-unclear

You can't have the exact same function appear as its own inverse. A negative slope will go down from left to right.

[algebra_challenge.html?seed=58&problem=7 (inverses_of_functions)](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/algebra_challenge.html?seed=58&problem=7&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/algebra_challenge.html?seed=58&problem=7&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%22%3Ccode%20style%3D%5C%5C%5C%22display%3A%20none%3B%20%5C%5C%5C%22%3Ex-1%3C%2Fcode%3E%5C%22%22%2C24%5D%2C%5B%22incorrect-activity%22%2C%22%5C%22None%20of%20the%20above.%5C%22%22%2C11%5D%2C%5B%22hint-activity%22%2C%220%22%2C2%5D%2C%5B%22hint-activity%22%2C%220%22%2C33%5D%2C%5B%22hint-activity%22%2C%220%22%2C37%5D%2C%5B%22hint-activity%22%2C%220%22%2C40%5D%2C%5B%22hint-activity%22%2C%220%22%2C44%5D%2C%5B%22hint-activity%22%2C%220%22%2C48%5D%2C%5B%22incorrect-activity%22%2C%22%5C%22%3Ccode%20style%3D%5C%5C%5C%22display%3A%20none%3B%20%5C%5C%5C%22%3E-x%2B1%3C%2Fcode%3E%5C%22%22%2C56%5D%2C%5B%22correct-activity%22%2C%22%5C%22%3Ccode%20style%3D%5C%5C%5C%22display%3A%20none%3B%20%5C%5C%5C%22%3E-x-1%3C%2Fcode%3E%5C%22%22%2C7%5D%5D)

["x-1","None of the above.","-x+1","-x-1"]

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11

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