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The relation between the weight of a diamond and its cost is linear. In looking at two diamonds, we find that one of the diamonds weighs 0.6 carat and costs $3188, while the other diamond weighs 0.7 carat and costs $3845. Linear function that relates the price of a diamond (P) to its weight (x) is P(X) = $6570x - 754. Interpret slope in context.

Question

The relation between the weight of a diamond and its cost is linear. In looking at two diamonds, we find that one of the diamonds weighs 0.6 carat and costs 3188,whiletheotherdiamondweighs0.7caratandcosts3188, while the other diamond weighs 0.7 carat and costs 3845. Linear function that relates the price of a diamond (P) to its weight (x) is P(X) = $6570x - 754. Interpret slope in context.

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Solution

The slope of the linear function in this context is 6570.Thismeansthatforeveryincreaseof1caratintheweightofthediamond,thepriceincreasesby6570. This means that for every increase of 1 carat in the weight of the diamond, the price increases by 6570. In other words, the slope represents the cost per carat of the diamond.

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The monthly cost of driving a car depends on the number of miles driven. Lynn found that in May it cost her $505 to drive 460 mi and in June it cost her $565 to drive 700 mi.(a) Express the monthly cost C as a function of the distance driven d, assuming that a linear relationship gives a suitable model.C(d) = (b) Use part (a) to predict the cost of driving 1100 miles per month.$ (c) Draw the graph of the linear function. What does the slope represent?It represents the fixed cost (amount she pays even if she does not drive).It represents the cost (in dollars) of driving.    It represents the cost (in dollars) per mile.It represents the distance (in miles) traveled.(d) What does the y-intercept represent?It represents the fixed cost (amount she pays even if she does not drive).It represents the distance (in miles) traveled.    It represents the cost (in dollars) of driving.It represents the cost (in dollars) per mile.(e) Why does a linear function give a suitable model in this situation?A linear function is suitable because the monthly cost increases as the number of miles driven decreases.A linear function is suitable because the monthly cost increases even if the miles driven is constant.    A linear function is suitable because the monthly cost is fixed despite the fact that the miles driven may vary.A linear function is suitable because the monthly cost increases as the number of miles driven increases.

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