need neat solution

1. (a) Use the method of integrating factor to solve the linear ODE 2 y\" + 2:173; = e'z [3] (b) Verify your answer. [2] 2. Use the method of integrating factor to solve the linear ODE y' 3y = 1 e'2\". [5] 3. Find the general solution y(m) of the following second order linear ODEa (a) y\"4y'+3y=0 (b) y\"4y'+4y=0 (c) y\"4y'+5y=0 (d) y\"+9y'=0 (e) y\"+9y=0 [10]