Here are a few problems that are giving me trouble when trying to figure out the equation of a line. I can't seem to figure out the rules that apply so if you could tip me off, I would greatly appreciate it.

1. The slope is undefined and the line passes through (1,4)

2. The equation of the y-axis

3. The equation of the x-axis

I have to put all answers into the point-slope formula y-y1=m(x-x1)

Thank you for your help!! It is greatly appreciated!!