A. write an equation that models the expression where y varies inversely with x. b. if y = 20 when x = 4, solve for k. c. rewrite your equation from part a., subbing in the value for k that you solved for in part b.

y = k/x, k = 80, and y = 80/x

a.The best way to solve this problem is using reverse proportionality, in which two magnitudes x and y are inversely proportional when there is a constant k. If y varies inversely with x, then y = k/x

b. If y = 20 when x = 4, then k = (x)(y) > k = (4)(20) = 80

c. y = 80/x

what are the options? ?

step-by-step explanation:

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50