Figure 14.21 shows the implementation using a delay for the difference equation y(k+1)+0.5y(k) = u(k). Figure 14.21 | Implementation using a delay. u(k) + y(k+1) y(k) Z-1 Σ + -0.5 For each of these difference equations draw the implementation using delays. 1. y(k+3) 1.6y(k + 2) + 0.68y(k+1) - 0.08y(k) = u(k) 5. y(k+2)-1.2y(k + 1) + 0.2y(k) = u(k) + 2u (k+1) 9. y(k+3)- 1.5y(k + 2) + 0.66y(k + 1) - 0.8y(k) = 3u(k+1)+2u(k)