if a1=(7,-1,4) a2=(4,0,1) and a3=(-3,5,0) and the set S={a1,a2,a3} is a basis for R3, how do you find the equation y=2a1-3a2+a3 (ps that is the answer, I just don't know how to get to it)

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perhaps I am reading this wrong

do you know the coordinates of y?

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