Khan/khan-exercises — Issue #10561: Systems of equations with substitution - hard
Author: KhanBugz
Created: 2012-01-06 19:34:08+00:00
State: open
Labels: hard, ie8, xp

to hard

[systems_of_equations_with_substitution.html?seed=81&problem=substitution-y](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/systems_of_equations_with_substitution.html?seed=81&problem=substitution-y&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/systems_of_equations_with_substitution.html?seed=81&problem=substitution-y&debug&activity=%5B%5D)

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