SOLUTION: During one month, a homeowner used 300 units of electricity and 140 units of gas for a total cost of $106.20. The next month, 250 units of electricity and 250 units of gas were use

Algebra ->  Customizable Word Problem Solvers  -> Finance -> SOLUTION: During one month, a homeowner used 300 units of electricity and 140 units of gas for a total cost of $106.20. The next month, 250 units of electricity and 250 units of gas were use      Log On

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Question 1179677: During one month, a homeowner used 300 units of electricity and 140 units of gas for a total cost of $106.20. The next month, 250 units of electricity and 250 units of gas were used for a total cost of $112.50. Find the cost per unit of gas.
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
system%28300e%2B140g=106.2%2C250e%2B250g=112.5%29

Question asks for g. Might be neat if try to eliminate terms of e.

%286%2F5%29%28250e%2B250g%29=%286%2F5%29%2A112.5

300e%2B300g=135

revised system:
system%28300e%2B140g=106.2%2C300e%2B300g=135%29

Subtract.
60g=28.8

highlight%28g=0.48%29----dollars per unit