In the following, pick out the linear systems
(i) d2y(t)/dt2 + 9a1dy(t)/dt + a2y(t) = u(t)
(ii) y(t)dy(t)/dt + a1y(t) = a2 u(t)
(iii) 2d2y(t)/dt2 + tdy(t)/dt + t2y(t) = 5
1
(i) and (ii)
2
(i) only
3
(i) and (iii)
4
(ii) and (iii)
In the following, pick out the linear systems
(i) d2y(t)/dt2 + 9a1dy(t)/dt + a2y(t) = u(t)
(ii) y(t)dy(t)/dt + a1y(t) = a2 u(t)
(iii) 2d2y(t)/dt2 + tdy(t)/dt + t2y(t) = 5