Khan/khan-exercises — Issue #14520: Algebra challenge - way to hard for me
Author: KhanBugz
Created: 2012-02-23 18:31:46+00:00
State: open
Labels: hard, ie8, ie9, win7

[algebra_challenge.html?seed=84&problem=substitution-y (systems_of_equations)](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/algebra_challenge.html?seed=84&problem=substitution-y&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/algebra_challenge.html?seed=84&problem=substitution-y&debug&activity=%5B%5D)

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