Solve. Assume the exercise describes a linear relationship.
-A gas station sells 4820 gallons of regular unleaded gasoline in a day when they charge $\$ 1.35$ per gallon, whereas they sell 3888 gallons on a day that they charge $\$ 1.40$ per gallon. Find a linear equation that relates gallons sold to price. Use this equation to predict the number of gallons sold at a price of $\$ 1.20$ per gallon.
A) $7620.1 \mathrm { gal }$
B) $7616 \mathrm { gal }$
C) $7625 \mathrm { gal }$
D) $7612.7 \mathrm { gal }$

Question

Quizplus · Accepted Answer

The linear equation is found using the two points (1.35, 4820) and (1.40, 3888). The slope is $(3888 - 4820) / (1.40 - 1.35) = -18640$. The equation is $y = -18640x + 30374$. Substituting $x = 1.20$ gives $y = 7616$.

Solve Assume the Exercise Describes a Linear Relationship $1.35\$ 1.35$1.35 Per Gallon, Whereas They Sell 3888 Gallons on a Day

Solve Assume the Exercise Describes a Linear Relationship $\$ 1.35$ Per Gallon, Whereas They Sell 3888 Gallons on a Day