difference equation using matlab

i am stucked with this question:

Y(k)=W(k)-3/2W(k+2)+1/2W(k+1),
W(k+3)=U(k)-5/8W(k)+3/8W(k+1)-1/4W(k+2),
U(k)=(2/3)^k, k>0

Print u(k),w(k) and y(k).

Plot u(k),w(k) and y(k).

[Andrew Newell]

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