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

Algebra ->  Linear-equations -> 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      Log On


   

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) About Me  (Show Source):
You can put this solution on YOUR website!
graph%28300%2C300%2C-10%2C65%2C-5%2C10%2C0.075x%2B2.5%29
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.