The length x of a rectangle is decreasing at the rate of 5 cm/minute, and the width y is increasing at the rate of 4 cm/minute. When x = 8 cm and y = 6 cm, find the rates of change of
A) -20 cm/minute, 24 cm/minute
B) -15 cm/minute, 20 cm/minute
C) -10 cm/minute, 16 cm/minute
D) -5 cm/minute, 12 cm/minute