Question

A

2. During one month, a homeowner used 400 units of electricity and 120 units of gas for a total cost
of $73.60. The next month, 350 units of electricity and 200 units of gas were used for a total cost of
$72. Find the cost of a unit of gas.
Define variables:
Equation:
Equation:
Solution:

Answer 1

Explanation:

120G + 400E = 73.60

400E = 73.60 - 120G

E = 0.184 - 0.3G

200G + 350E = 72.00

200G + 350(0.184 - 0.3G) = 72.00

200G + 64.4 - 105G = 72.00

95G = 7.60

G = $0.08/unit