Let f be defined as follows. y = f(x) = x - 8x (a) Find the average rate of change of y with respect to x in the following intervals. from x = 5 to x = 6 3 Fantastic job! from x = 5 to x = 5.5 3.5 from x = 5 to x = 5.1 2.1 X Perfen! (b) Find the (instantaneous) rate of change of y at x = 5. 4 x