Problem 3. Consider the following continuous differential equation dx dt = αx − 2xy dy dt = 3xy − y 3a (5 pts): Find the steady states of the system. 3b (15 pts): Linearize the model about each of the fixed points and determine the type of stability. 3b (15 pts): Draw the phase portrait for this system, including nullclines, flow trajectories, and all fixed points. Problem 2 (25 pts): Two-dimensional linear ODEs For the following linear systems, identify the...
Consider the non-linear system y-y(1-x-y). (a) Find equations for all of the x- and y-nullclines. (b) Find the coordinates of each equilibrium point of the system. (c) Sketch the nullclines in the phase plane. Clearly mark the equilibrium points. Also indicate the direction of flow on the nullclines. Consider the non-linear system y-y(1-x-y). (a) Find equations for all of the x- and y-nullclines. (b) Find the coordinates of each equilibrium point of the system. (c) Sketch the nullclines in the...
Consider the following. x = 8x + y y' - 2x + 6y. X(O) = (-1,2) (a) Find the general solution (x(t), y(t) = Determine whether there are periodic solutions. (If there are periodic solutions, enter the period. If not, enter NONE.) NONE (b) Find the solution satisfying the given initial condition (x(6), y(t)) - (c) With the aid of a calculator or a CAS graph the solution in part (b) and indicate the direction in which the curve is...
2. (28 marks) This questions is about the following system of equations x = (2-x)(y-1) (a) Find all equilibrium solutions and determine their type (e.g., spiral source, saddle) Hint: you should find three equilibria. b) For each of the equilibria you found in part (a), draw a phase portrait showing the behaviour of solutions near that equilibrium. -2 (c) Find the nullclines for the system and sketch them on the answer sheet provided. Show the direction of the vector field...
Consider the nonlinear system ?x′ = ln(y^2 − x) and y'=x-y-1 (a)Find all the critical points (b)Find the corresponding linearized system near the critical points. (c) Classify the (i) type (node, saddle point, · · · ), and (ii) stability of the critical points for the corresponding linearized system. (d) What conclusion can you obtain for the type and stability of the critical points for the original nonlinear system?
7. The system r, = 2(r-1)y. y' = x + y-2, has an equilbrium point at (1,1). This equilibrium point is a(n) (a) unstable node (b) center. (e) saddle (d) unstable focus. 7. The system r, = 2(r-1)y. y' = x + y-2, has an equilbrium point at (1,1). This equilibrium point is a(n) (a) unstable node (b) center. (e) saddle (d) unstable focus.
Consider the plane autonomous system 4) 2 X'=AX with A (a) Find two linearly independent real solutions of the system (b) Classify the stability (stable or unstable) and the type (center, node, saddle, or spiral) of the critical point (0,0). (c) Plot the phase portrait of the system containing a trajectory with direction as t-oo whose initial value is X(0) (0,6)7 and any other trajectory with direc- tion. (You do not need to draw solution curves explicitly.) Consider the plane...
Problem 8. 1 point) a. Find the most general real-valued solution to the linear system of differential equations x (1) C: + C2 x2 (1) b. In the phase plane, this system is best described as a source / unstable node sink / stable node saddle center point / ellipses spiral source spiral sink none of these
The following problem can be interpreted as describing the interaction of two species with populations x and y. (A computer algebra system is recommended.) dx dy =y(3.5-y-s). (b) Find the critical points. (Order your answers from smallest to largest x, then from smallest to largest y.) G1 (x, ) 0,0 C2 (x, y)-(10. C3 (x, y) (11,0 (c) For each critical point find the corresponding linear system. (Let u =x-xo and v = y-yo where (Xo, yo) is the critical...
Problem 7. (1 point) a. Find the most general real-valued solution to the linear system of differential equations X' = [ * ] x1(1) C1 x2(1) + C2 b. In the phase plane, this system is best described as a source / unstable node sink / stable node saddle center point / ellipses O spiral source spiral sink none of these