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Elina N.

Experienced Tutor Chemistry, Biology, Earth Science, Regents, SAT

Brooklyn, NY (11235)

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First you have to solve for one of the variables in terms of the other.  Take one of the equations for example a+b=1000 and  solve for a to get a=1000-b.  Now you can substitute this expression into the other equation instead of a.  7a+15b=11504 becomes 7(1000-b)+15b=11504...

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