Karina uses the system of equations below to compare the monthly utility costs in July and December for electricity, x, and natural gas, y.
750x + 17y = 141.61
300x + 30y = 75.90
Karina solves the system using linear combination and arrives at the equation 116y = 96.28. She then solves this equation for y. Which statement explains Karina's solution?
The cost of electricity is $0.17 per unit.
The cost of natural gas is $0.20 per unit.
The cost of electricity is $0.72 per unit.
The cost of natural gas is $0.83 per unit.
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