I can't believe I'm having so much trouble

#1:

For which values of k are the following pairs of lines parallel? perpendicular?

3x+4y=9

x+ky=6

#2:

(k-1)y+(k+1)x+k-1=0 (k is a constant)

For what value of k is the graph of this function parallel to the x-axis?

I tried re-arranging it, but it confused me even more.

Please help