Water is leaking out of a red cylindrical tank into a blue cylindrical tank that has been placed
beneath the table on which the red tank stands. The height of the water in the red tank at time
t can be represented by a linear function. The height of the water in the blue tank at time t can
also be represented by a linear function. Under what condition would the rates of change of the
two functions be negatives of each other? Explain your reasoning.
