The graph shows the amount of water that remains in a barrel after it begins to leak. The variable x represents the number of days that have passed since the barrel was filled, and y represents the number of gallons of water that remain in the barrel. A graph titled Water Supply with number of days on the x-axis and gallons of water left on the y-axis. A line goes through points (6, 33) and (15, 15). What does the y-intercept represent?
![The graph shows the amount of water that remains in a barrel after it begins to leak The variable x represents the number of days that have passed since the bar class=](https://us-static.z-dn.net/files/d98/ba693c902c9ff851deeba02b0ceb1fcf.png)