SOLUTION:
during one month a homeowner used 400 units of electricity and 120 units of gas for a total of 72$. the next month 500 units of electricity and 180 units of gas were used for a t
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Question 703322:
during one month a homeowner used 400 units of electricity and 120 units of gas for a total of 72$. the next month 500 units of electricity and 180 units of gas were used for a total cost of $93. find the cost per unit of the electricity
Answer by checkley79(3341) (Show Source): You can put this solution on YOUR website!
400E+120G=72 MULTIPLY BY -1.25 & ADD
500E+180G=93
-500E-150G=-90
-----------------------
30G=3
G=3/30
G=$.10 ANS.
400E+120*.10=72
400E+12=72
400E=72-12
400E=60
E=60/400
E=$.15 ANS.
PROOF:500*.15+180*.10=93
75+18=93
93=93
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