Answer Happy

Please show me with steps.
5. Sketch the waveforms represented by: (a) x(t) = r(t) r(t-2) - u(t-2) - 2u(t-3) + u(t-4) (b) y(t) = -4u(t) + 2u(t-2) + 2r(t-2) - 6u(t-4) + 4u(t-6)