A water tank is being emptied at a constant rate. The equation below describes the relationship between the number of minutes (x) the tank is emptied and the gallons of water (y) in the tank. x+5y=100 How many gallons of water are in the tank when it is full? 100 5 20

To find out how many gallons of water are in the tank when it is full, we need to determine the value of y when x is 0. This is because when the tank is full, the number of minutes it has been emptied is 0.<br /><br />Given the equation:<br />\[ x + 5y = 100 \]<br /><br />We set \( 0 \) and solve for \( y \):<br />\[ 0 + 5y = 100 \]<br />\[ 5y = 100 \]<br />\[ y = \frac{100}{5} \]<br />\[ y = 20 \]<br /><br />So, when the tank is full, there are 20 gallons of water in it.