a) (2,3,4)
b) (1,1,1)
c) There are an infinite number of solutions
d) There are no solutions
e) We can't tell without having the system of equations
a) We have three equations for the same plane.
b) At least two of the equations represent the same plane.
c) The three planes intersect along a line.
d) The planes represented are parallel.
e) More than one of the above choices are possible.