Answer:
<u>The answer is G = 20 - m/18, but none of the answers given is correct.</u>
Step-by-step explanation:
1. Let's review the information given to us to help Lulu to answer the question correctly:
Capacity of the gas tank of Lulu's car = 20 gallons
Lulu can travel 216 miles using 12 gallons
2. Which linear equation represents the number of gallons of gas, G, left in the tank after driving m miles?
G = number of gallons left in Lulu's car
m = Miles driven by Lulu
miles per gallon = 216/12 = 18 miles per gallon
Now, we can write the linear equation, this way:
G = Capacity of the gas tank of Lulu's car - miles driven/miles per gallon
Replacing with the values we know:
<u>G = 20 - m/18</u>
Let's assume Lulu drives 180 miles, using our linear equation, we have:
G = 20 - 180/18
G = 20 - 10 = 10 gallons left
Let's assume Lulu drives 54 miles, using our linear equation, we have
G = 20 - 54/18
G = 20 - 3 = 17 gallons left
