Consider the following system:

x + y + az = 1

x + ay + z = 4

ax + y + z = b

For which values of a does the system have a unique solution, and for which pairs

of values (a; b) does the system have more than one solution? The value of b does

not have any effect on whether the system has a unique solution. Why?

How do I go about doing this? It's already in reduced form. Idk what to do =/