We often deal with "simple" signals in a signals-and-systems course that can be easily described as a linear combination of time-shifted unit step and unit ramp functions.
In this video example we're provided a sketch of a "simple" signal x(t) and we develop an equation for x(t) in terms of time-shifted unit step and unit ramp functions.
![](https://i.ytimg.com/vi/jl9vlXYo9GM/maxresdefault.jpg)