Charlotte filled up her car with gas before embarking on a road trip across the country. The capacity of Charlotte's gas tank is 12 gallons and the car uses 0.75 gallons of gas for every hour driven. Write an equation for G, commaG, in terms of t, commat, representing the number of gallons of gas remaining in Charlotte's gas tank after tt hours of driving.
The equation for G in terms of t can be given as:
G = 12 - 0.75t