dont want matlab answer, please show the graph with drawing

Consider a system of two periodic tasks: $T1=(4\mathrm{.}5,2),T2=(6,2).$ They are scheduled by RM$.$

An aperiodic task A with execution time $1\mathrm{.}5$ is released at $0\mathrm{.}1.$ Construct the schedule of

the system in the first $15$ units of time in each of the following three cases:

a$.[5$pts$]A$ is scheduled at the background of $T1$ and $T2.$

b$.[5$pts$]A$ is scheduled using a simple polling server $Ts=(4,0\mathrm{.}5).$

c$.[5$pts$]A$ is scheduled using a deferrable server $Tds=(4,0\mathrm{.}5).$