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Interpreting a Step Signal

Please see the attachment.

The image is described by y(t)=t-tu(t-1)-t(u(t-2))+t(u(t-3)).

I don't get this. Please point out where the signal turns on and off and why. To me, it looks like a ramp, a step, and then a ramp with neg amplitude.

I can do the rest of the problem, i.e. the laplace transform and the other parts.



Solution Summary

The solution is provided in an attachment and uses for diagrams to show how the plot of y(t) is derived.