A particle moves along the curve y= 15/(x² +1.3ˣ) for x>0. The x-coordinate of the particle changes at a constant rate of 3unit spersecond. At the instant when the y-coordinate of the particle is 2, what is the rate of change of the y-coordinate of the particle, in units per second?
a. -0.466
b. -0.787
c. -1.397
d. -4.190