The graph shows that from 2000 through 2006, Americansunplugged land lines and switched
Chapter 5, Problem 68(choose chapter or problem)
The graph shows that from 2000 through 2006, Americansunplugged land lines and switched to cellphones.a. Use the graphs to estimate the point of intersection. Inwhat year was the number of cellphone and land-linecustomers the same? How many millions of customerswere there for each?b. The function 4.3x + y = 198 models the number ofland-line customers, in millions, x years after 2000. Thefunction y = 19.8x + 98 models the number of cellphonecustomers, in millions, x years after 2000.Use these modelsto determine the year, rounded to the nearest year, whenthe number of cellphone and land-line customers wasthe same. According to the models, how many millions ofcustomers, rounded to the nearest ten million, were therefor each?c. How well do the models in part (b) describe the pointof intersection of the graphs that you estimated in part (a)?
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