SOLUTION: a gas station sells 4820 gallons of regular unleaded gasoline in a day when they charge $1.35 per gallon, whereas they sell 3861 gallons on a day they they charge $1.40 per gallon.

Question 1033156: a gas station sells 4820 gallons of regular unleaded gasoline in a day when they charge $1.35 per gallon, whereas they sell 3861 gallons on a day they they charge $1.40 per gallon. Find a linear function that expresses gallons sold as a function of price. Use this function to predict the number of gallons sold at a price of $1.17 per gallon
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
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

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