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If a point lies on the x-axis then by definition it is located at (x,0) ie the y coordinate is 0.If a point lies on the y-axis then it's located at (0,y) ie the x coordinate is 0.
It is 0.
It is always the X axis, and the dependent variable is on the Y.
When z = 8, z lies straight along the real axis, so r = 8 and theta = 0°
The y coordinate is 0.