SOLUTION: You need to buy a new refrigerator for your house. There are two models that are comparing. A standard model cost $400 dollars and uses $8 dollars of electricity per month. An ener

Question 1134605: You need to buy a new refrigerator for your house. There are two models that are comparing. A standard model cost $400 dollars and uses $8 dollars of electricity per month. An energy efficient model costs $800 dollars and uses $4 of electricity per month.
1. Write a linear equation that represents the total cost of the standard model of the refrigerator. Use C for the total cost and t for time measured in months.
2. Write a linear equation that represents the total cost of the energy efficient model of the refrigerator. Use C for the total cost and t for time measured in months.
3. Label both axis and then graph the system of equations from 1 and 2. Indicate and label the solution to the system of equations on the graph.
4.Solve the linear system from questions 1 and 2 using the substitution method.
5. Solve the linear system from questions 1 and 2 using the elimination method.
6. What does the intersection of the lines tell you about the two refrigerators?
7. How are the solutions in 3,4,and 5 related? why are they related in this fashion?
8. What refrigerator would you buy? Justify your answer.
Answer by Glaviolette(140) (Show Source): You can put this solution on YOUR website!
The graph is just done on notebook paper and I used the solutions from 4 and 5 to help with the graphing.

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