Khan/khan-exercises — Issue #10802: Systems of equations with substitution - You should give people two tries
Author: KhanBugz
Created: 2012-01-10 01:41:11+00:00
State: open
Labels: chrome, hard, vista

I work for hours getting all the problems correct then i get one wrong and that is what frustrates me and a lot of other people out there

[systems_of_equations_with_substitution.html?seed=152&problem=substitution-y](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/systems_of_equations_with_substitution.html?seed=152&problem=substitution-y&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/systems_of_equations_with_substitution.html?seed=152&problem=substitution-y&debug&activity=%5B%5D)

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Mozilla/5.0 (Windows NT 6.0; WOW64) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.75 Safari/535.7

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