Is b a linear combination of a1, a2, and a3?
a1= (1, -2, 0); a2= (0,1,2); a3=(5, -6, 8); b= (2,-1,6)

A1 = (1, -2 , 0) ; a2 = (0,1,2) ; a3 = (5,-6,8) ; b = (2,-1,6)

2*a1 = (2, -4,0)
3*a2 = (0, 3, 6)

sum = (2, -1, 6) = b

Hope this helps

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You can find it by multiplying the areas it show u