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[1,4,2,8]^t = v1

[2,5,3,9]^t = v2

[11,14,12,18]^t = v3

[4,3,2,1]^t = v4

and im asked to express the vector v= [7,9,6,8]^t in two ways as a linear combination of {v1,v2,v3,v4}?

I know the vectors are linearly independent cause none of the vectors are multiples of each other, but i cant seem to find a c1,c2,c3,c4 that will work, am i missing something?