A system of ordinary differential equations formulated as follows: (/) = - - (/) = + a + w (/) = b + (w/ ) = - c + fw a) Develop the stock-flow representation (a network of stocks and flows that are coupled by information feedback) of such a system. b) Simulate the system behavior (using Vensim) with initial values of x0= - 20, y0=0, z0=0, w0= 15. Plot X vs. Y. (a = 0.25, b = 3, c = 0.5, f = 0.0