SOLUTION: During one month, a homeowner used 400 units of electricity and 100 units of gas for a total cost of $258. The next month, 300 units of electricity and 150 units of gas were used f

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Question 1192473: During one month, a homeowner used 400 units of electricity and 100 units of gas for a total cost of $258. The next month, 300 units of electricity and 150 units of gas were used for a total cost of $210. Find the cost per unit of gas.
Answer by Alan3354(69443) About Me  (Show Source):
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During one month, a homeowner used 400 units of electricity and 100 units of gas for a total cost of $258. The next month, 300 units of electricity and 150 units of gas were used for a total cost of $210. Find the cost per unit of gas.
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400E + 100G = 258 X1.5 --> 600E + 150G = 387
300E + 150G = 210
600E + 150G = 387
---------------------------- Subtract
-300E = - 177
E = $0.59
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Solve for G