Continuous-Time System:
a1 = 6, a0 = 9, b1 = -2, b0 = -8, 

Your excitation signal x(t) consists of straight lines connecting these points.
It has been zero up until the first time and is zero after the last time.

t = 2.00866, x(t) = 0
t = 2.00866, x(t) = 18
t = 4.73078, x(t) = 18
t = 4.73078, x(t) = 9
t = 5.12395, x(t) = 9
t = 5.12395, x(t) = 0
t = 5.29082, x(t) = 0
t = 5.29082, x(t) = -7
t = 6.88625, x(t) = -7
t = 6.88625, x(t) = 1
t = 7.98246, x(t) = 1
t = 7.98246, x(t) = -10
t = 10.2471, x(t) = -10
t = 10.2471, x(t) = 0
t = 15.3849, x(t) = 0

Discrete-Time System:
a0 = -15, a1 = 12, b0 = 26, b1 = -3, 
0 <= n < 6,  x[n] = 0
6 <= n < 13,  x[n] = -3
13 <= n < 14,  x[n] = 8
14 <= n < 30,  x[n] = 0

x[n] has been zero up until the first time and is zero after the last time.