Question: How to plot this?

I need to plot this. Help!!!!! I am stuck.

 

with(linalg):

A := matrix(2,2,[1,1,4,1]);

exp(A*t);

B := exponential (A, t);

c := matrix(2,1,[c1,c2]);

multiply(B,c);

x := t-> first row of the matrix above

y:= t-->second row of the matrix above

I need to plot x and y in this case. What do I do next ???? :(

 

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