This response demonstrates an incomplete application of a reasonable strategy. An equation is not provided. A slope is not given but the contextual meaning is complete (how much the value decreases each year). The age of a computer valued at $300 is correct (about 2½ years old) and the explanation supports the solution (At 3 years old its $200 and at 2 years it was about $400 so $300 is in the middle of 2 and 3 years and that's 2½). The student states that the equation would not be a good prediction model and the justification supports the solution (according to the equation and graph you will have to pay someone to buy your computer. The computer will be worth a negative amount). This response demonstrates a conceptual understanding and analysis of the problem.
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