How would this question and answer look like as a graphic representation using GeoGebra or demos graphing calculator? I solved this but I don't know how to graph it in these graphing applications.

problem

Suppose a population of fruit flies is introduced to disease and decreases at a rate of15%in flies per day. Suppose the initial population of fruit flies is 950 flies. How many flies are left in the population after 5 days?

answer:

Initial population = 950 The population decreases at a rate of 15% Using the formula y = y0e-kt P(t) = 950 p-0.15t After 5 days, let t = 5 P(5) = 950e-0.15(5) = 950p-0.75 = 448.748225 The population after 5 days would be rounded up to 449