Time Invariance
A system is time invariant if an input signal x(t) corresponds to the output signal y(t) despite any scaling due to time.
x(t-t0) -> | | -> y(t-t0) Shifted input yields shifted output
y(t) = 7*x(t)
x(t) delayed = x(t-t0) -> | sys | -> 10* x(t-t0) x(t) -> |sys| = 10* x(t) -> delayed -> 10* x(t-t0)
Same result therefore time invariant.
