The linear model below shows the number of gallons of gas remaining in Sierra's car after she has driven x miles.
According to the model, how many gallons of gas does Sierra's car hold on a full tank (when the number of miles driven is zero)?
A. 16
B. 19
C. 15
D. 21
![The linear model below shows the number of gallons of gas remaining in Sierras car after she has driven x miles According to the model how many gallons of gas d class=](https://us-static.z-dn.net/files/dc0/b60c4f066477d068533416fce5fdb0de.jpg)