Linearity
Because engineers talk in symbols instead of words...the following describes linearity.
- A/*B = multiply by any complex number
x(t) --> system --> *A | + --> w(t) | y(t) --> system --> *B x(t) --> *A | + --> system --> z(t) | y(t) --> *B
If z(t) == w(t) then the system is linear.
In linearity, the values are scalable and follow the rules of superposition.