Please write this code in MATLAB...

3) Systems of Differential Equations Solve the following differential equation using the stated method on te [0,20], At = 0.15 x' = -3x + y - 2 y' = 4x 2y + z z' = 2x + 2y Z And initial conditions of x(0) = y(0) z(0) = 1 a) Using Euler's method. Save on HW7_9.dat b) Using RK2. Save on HW7_10.dat c) Using Matlab's ode45. Save on HW7_11.dat 3) Systems of Differential Equations Solve the following differential equation using the stated method on te [0,20], At = 0.15 x' = -3x + y - 2 y' = 4x 2y + z z' = 2x + 2y Z And initial conditions of x(0) = y(0) z(0) = 1 a) Using Euler's method. Save on HW7_9.dat b) Using RK2. Save on HW7_10.dat c) Using Matlab's ode45. Save on HW7_11.dat