The graph shows the relationship between the time (in seconds) and number of gallons of water in a sink. The sink starts out with 8 gallons and drains at a constant rate of 35 gallons per second.
Which function represents the situation?
A f(x) = 3/5x+8
B f(x)= 3/5x-8
C f(x)= -3/5x+8
D f(x)= -3/5x-8