I need help with these questions.....they're from grade 12 geometry and discrete math.

1. Analyse the normal vectors of the following planes and describe the situation of each system. Include a geometric interpretation of each solution:

7x-5y+4z-9=0

-5x+4y+z-3=0

x+2y-z+1=0

2. Analyse the normal vectors of the following planes and describe the situation of each system. Include a geometric interpretation of each solution:

7x-5y+4z-9=0

-x+3y+5z-2=0

5x+y+14z-20=0