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

### Brooklyn, NY (11235)

 Travel radius 5 miles Hourly fee \$65.00 Save up to 15%
 Background check passed 03/09/2013 Usually responds in about 8 hours You don't pay for tutoring unless you find a good fit! You don't pay for tutoring unless you find a good fit!

# if a+b=1000, and 7a+15b=11504, what is value of a and b? (answer)

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.   Now we expand the...

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