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