There are infinitely many possible locations.
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The first section.
Yes, almost all the time. And when it is not coordinate planes it is coordinate hype-spaces (more than just the 2 dimensions that the coordinate plane allows).
All points with a 0 for the x coordinate is the y axis.
All the real numbers between 1 and 0. 0.0000001,0.000000001,0.0000000000012345265262527363736372763,etc.
Whereas the procedure for a linear equality is the same, the inequality defines all of the plane on one side (or the other) of the corresponding line.