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Retric
on May 31, 2014
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Who or What Broke My Kids?
Take something real simple "Solve X + Y = 2; X + 2Y = 4 using substitution."
At the basic level that has 4 choices, you can substitute X or Y in the top or bottom equation.
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At the basic level that has 4 choices, you can substitute X or Y in the top or bottom equation.