Final answer:
The relationship between the gallons of water in the tank and the minutes it has been draining is represented by a linear equation, typically in the form G = a - b × t, where 'G' represents gallons, 't' represents time, 'a' is the initial volume, and 'b' is the drainage rate.
Step-by-step explanation:
To represent the relationship between the gallons of water in the tank and the minutes the tank has been draining, we need to establish key variables first. Let's assume the rate at which the tank drains is constant and denote the gallons of water as G and the time in minutes the tank has been draining as t. Typically, such a situation is modeled with a linear equation due to the constant rate of change, so the equation could look something like G = a - b × t, where a is the initial number of gallons in the tank, and b is the rate of drainage in gallons per minute. To determine the constants a and b, additional information such as the initial volume and drainage rate would be needed.