Ervin sells vintage cars. Every three months, he manages to sell 13 cars. Assuming he sells cars at a constant rate, what is the slope of the line that represents this relationship if time in months is along the x-axis and the number of cars sold is along the y-axis?
Ervin sells 13 cars per 3 months so 13/3=4.3 cars per month.Â
this means thatÂ
___month___ Â Â ___cars sold___
     1             4.3      2           2*4.3      3           3*4.3      :              :      n           n*4.3
the linear function representing the cars sold per month is f(n)=4.3*n
(Practically, this means that the expected number of cars sold after n months is a whole number close to 4.3*n.)
