myanniespencer39
03.12.2019 •
Mathematics
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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Ответ:
D. 0.83
Step-by-step explanation:
The cost of natural gas is $0.83 per unit.
just did it
Ответ:
The cost of natural gas is $0.83 per unit.
Furthermore, the cost of electricity is $0.17 per unit.
The solution can also be determined by elimination or substitution. Others methods such as the Gauss-Jordan can be used as well.
Ответ:
The slope: -1
The y intercept form: (0,1)
If you want it in equation form: y=-x+1
How it looks when Graph-ed: