Homework problem that I dont even know what it wants let alone how to solve it.

Solve the linear system and write the solution x as x=x(p) + x(h), where h(p) is a particular solution to the given system and x(h) is a solution to the associated homogeneous system.

x-y-2z+3w = 4

3x+2y-z+2w=5

0x-y-7z+9w=-2

Thank you much!