The sales for best buy were approximately 35.9 billion i 2006 (t=6) and $40.0 billion in 2007 (t=7)

Question

 find the slope of the line that would model this data

what does it mean in the context of the problem 

find linear equations that models this data 

using your equation, predict what total sales for 2020 based on this information

Answer 1

Find the slope between the points:

 

(6, 35.9) and (7, 40)

 

Use the slope formula to find slope.   The slope tells you the sales per year in (billions per year).

 

 

Use the point-slope form of a line to find the linear equation.

 

f(x) = m(x - 7) + 40

 

where:

f(x) is the sales (in billions)

m = slope that you found

 

To find the sales in 2020, evaluate f(20).