I'd start by calculating the determinant...
If the matrix V = [(1, 3, 5), (2, 4, 6), (3, 5, z)]. For what values of z will the system Vx = [9, 10, 11] have
1. a unique solution?
2. an infinite number of solutions.
3. no solutions.
Show your work please.
I really can't get this one!