Suppose A=[a1 a2 a3] is an invertible 3x3 matrix satisfying:

A(1 2 1 )= (1 0 0) and A(-1 -1 2)=(1 1 0) (those are supposed to be columns not rows sorry)

(a) Determine the first column of A-1

(b)Determine the second column of A-1

hint: the transformations associated are linear.

If someone could please explain how to do this it would be greatly appreciated.