Continuous-Time System:
a1 = 21, a0 = 19, b1 = 4, b0 = 3, 

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 = 1.60513, x(t) = 0
t = 1.60513, x(t) = -6
t = 1.81473, x(t) = -6
t = 1.81473, x(t) = 0
t = 2.06751, x(t) = 0
t = 2.06751, x(t) = -7
t = 3.71633, x(t) = -7
t = 3.71633, x(t) = 0
t = 6.44671, x(t) = 0
t = 6.44671, x(t) = -24
t = 7.09521, x(t) = -24
t = 7.09521, x(t) = -10
t = 7.4269, x(t) = -10
t = 7.4269, x(t) = 0
t = 14.3388, x(t) = 0

Discrete-Time System:
a0 = -29, a1 = -28, b0 = 19, b1 = 10, 
0 <= n < 4,  x[n] = 0
4 <= n < 9,  x[n] = -9
9 <= n < 11,  x[n] = -20
11 <= n < 16,  x[n] = -13
16 <= n < 26,  x[n] = 0

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