Is Transmission line (PCB trace) a LTI system?

Consider a 10" FR4 pcb trace, data rate is up to 5G. Do you think the pcb trace is a LTI (linear, time-invariant) system?

Thanks.

LTI system
x1(t)-->y1(t)
x2(t)-->y2(t)
a*x1(t-t0)+b*x2(t-t1)-->a*y1(t-t0)+b*y2(t-t1)

Transmission line eq.
v(z,t)=|V0|*cos(wt-beta*z)*exp(-alpha*z)

This is LTI function