Being a newcomer to Mathematica, I have this question:

Given

    x = Range@9~Partition~3;

and

    y = {a, b, c};

I want to combine x and y so that 

    result = {{a, 1, 2, 3}, {b, 4, 5, 6}, {c, 7, 8, 9}};

I have written

    MapPrepend[a_, b_] := Prepend[a[[#]], b[[#]]] & /@ Range@Length@b

which does the job, but I wonder if there are other, more functional solutions?

Probably this question has already been answered. In this case it would be very nice if you just would direct me to the links.