Exercise 7: Finding the transfer function and the corresponding time constant of first order system

Exercise 7: For the following model, 6 𝑥 ̇+5 𝑥=𝑓(𝑡)
Find the transfer function and the corresponding time constant. How long does it take to reach 63% and 98 % of steady state response?
If 𝑓(𝑡)=18 𝑢_𝑠 (𝑡) (step with constant 18) find the steady state response.
If 𝑓(𝑡)=18 𝛿(𝑡) (impulse with constant 18) find the steady state response.
Use Simulink to check your answers for part (a), (b) and (c).