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perhaps I am reading this wrong

do you know the coordinates of y?

y=(-1,3,5)

didnt think it was part of it, but they did mention that a little before

yes, that is the important bit. a1(x,y,z) = (7,-1,4) a2(x,y,z) = (4,0,1) and a3(x,y,z) = (-3,5,0)

right, so how do we find the linear combination?

so 7m+4n-3p=-1
-m+5p=3
and4m+n = 5

ahh ok thanks a lot, then solve the matrix from there eh?

did we change it from cartesian?

it follows that [y]s=(2,-3,1) in the text, this isn't a coordinate?

no, those are the coefficients of the linear combination.

i gotta run, hope that helped!

thanks!