Question 1033156
Identify the variables and decide which way you want them in the function.


The best choice is price for the independent variable and gallons per day sold for the dependent variable.  Call the ordered pair points generally   (p,v).


The description gives two points:  (1.35, 4820) and (1.4, 3861).


Using the two points for slope and choosing the point (1.35, 4820) to build the equation, the function starting from POINT-SLOPE FORM, without any further explanation, is  {{{highlight(v-4820=((4820-3861)/(1.35-1.4))(p-1.35))}}}


You simplify the equation and use it to finish answering the second part of the question.