SOLUTION: During one month, a homeowner used 300 units of electricity and 130 units of gas for a total cost of $110.30. The next month, 220 units of electricity and 250 units of gas were use

Question 1050529: During one month, a homeowner used 300 units of electricity and 130 units of gas for a total cost of $110.30. The next month, 220 units of electricity and 250 units of gas were used for a total cost of $97.90. Find the cost per unit of gas.
Answer by advanced_Learner(501) (Show Source): You can put this solution on YOUR website!
300x+130y=110.30
220x+250y=97.90

Solved by pluggable solver: SOLVE linear system by SUBSTITUTION

Solve:
We'll use substitution. After moving 130*y to the right, we get:
, or . Substitute that
into another equation:
and simplify: So, we know that y=0.11. Since , x=0.32.

Answer: .

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