Question 465677
The matrix {{{(matrix(3,3, -3,-3,-18,2,5,24,4,0,h))}}} must have rank less than 3. 

After reducing to row echelon form, the matrix becomes {{{(matrix(3,3, 1,1,6,0,1,4,0,0,(8-h)/4))))}}}.

==> h = 8 for linear dependence.

==> y is in the plane spanned by v1 and v2 if h = 8.