3. Given the following system of equations
2x + y + 3z = a
x + y - z = b
3x + 2y + 2z = c
(a) Solve this system of equations
(b) Describe what values of a, b and c results in the system of equations having no solutions (if any exist).
(c) Describe what values of a, b and c results in the system of equations having a unique solution (if any exist).
(d) Describe what values of a, b and c results in the system of equations having infinite solutions (if any exist).