Answer :
slope = difference in y / difference in x
slope = 12.25 -8.3 / -8.5 -.2
slope = 3.95 / -8.7
slope = -0.4540229885
slope = 12.25 -8.3 / -8.5 -.2
slope = 3.95 / -8.7
slope = -0.4540229885