please solve all questions.if any data is missing then you can assume data as you wish

Let k be a real number and (M) be the following system. xty =0 (M): 1 2x + y= k-1 Using Cramer's Rule, the solution of (M) is O X=k-1,y=1-k O None of the mentioned O x=1-k,y=2-2k O X=1-k,y=2k-2 Let W = {(0, x, y, z): x - 3y + 9z = 0 } be a subspace of R4. Then a basis for W is: O {(0,3,1,0), (0,-9,0,1)) O {(0,-6,1,0), (0,9,0,1)} O None of the mentioned O {(0,6,1,0), (0,-9,0,1)}