frctl Posted March 7, 2020 Share Posted March 7, 2020 In 2002 the cost of a textbook was $120.00 and in 2013 it was $212.00. a. Assuming the cost of the textbook increases linearly as a function of time, give the function of the cost of the textbook since 2002. b. Give the interpretation of the slope of the function in part (a). c. A book is considered to be unaffordable when its price is more than $300.00. If the increase in price follows this linear trend, when will the book be unaffordable? Link to comment Share on other sites More sharing options...
Ghideon Posted March 7, 2020 Share Posted March 7, 2020 Here are some hints: What have you tried so far? Do you have an idea how to start? Does it help to draw a simple picture using time as x-axis and price as y-axis? Link to comment Share on other sites More sharing options...
frctl Posted March 8, 2020 Author Share Posted March 8, 2020 Thank you Link to comment Share on other sites More sharing options...
Country Boy Posted March 10, 2020 Share Posted March 10, 2020 Any linear function of x can be written f(x)= ax+ b for numbers a and b. You are told that f(2002)= 120= 2002a+ b and f(2013)= 212= 2013a+ b. Solve the equations 2002a+ b= 120 and 2013a+ b= 212 for a and b. Link to comment Share on other sites More sharing options...
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