Overnight rain has left 8 gallons of water in Juan's boat. Juan secures a small container and begins scooping the water out at a constant rate of 0.5 gallons per minute. Let G(t) denote the amount of water (in gallons) that remains in the boat t minutes after Juan begins scooping. The equation below relates G(t) and t. G(t) = -0.5t + 8