SOLUTION: The worldwide consumption of cigarettes has been increasing steadily in recent years. The number of trillions of cigarettes, y, purchased x years after 1960, is estimated by the li

Question 1082104: The worldwide consumption of cigarettes has been increasing steadily in recent years. The number of trillions of cigarettes, y, purchased x years after 1960, is estimated by the linear equation
y= .075x+2.5
(a) sketch a graph of the linear equation
(b) what interpretation can be given to the y-intercept of the graph?
(c) When were there 4 trillion cigarettes sold?
(d) If this trend continues, how many cigarettes will be sold in the year 2020?

Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!

The y-intercept represents consumption in 1960.
4=.075x+2.5
1.5=0.075x
x=20, and that would be 1980.
in 2020, x=60 and y=.075*60+2.5=4.5+2.5=7 trillion.
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