Question: how change the color in loop


i have a loop as follows

for i from 0 to 10 do
> y:= i/2;
> f:= 2*x+y;
> plot(f,x);
> end
> ;

i want each graph with different color depend upon the value of y. in other mean, for each value of y, the color of the graph is defferent. 

could you help me in this problem?

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