the moment of inertia of a body about a given axis is equal to the sum of its moment of inertia about a parallel axis passing through its centre of mass and the product of its mass and square of perpendicular distance between two axis
Iz=Ix+Iy
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It's called an ORDINATE. when there is a straight line 100% parallel to the x axis, it's slope is 0. If a line is parallel to the y axis, its slope is undefined, or infinite.
The slope is undefined.
That is impossible, because, if it is parallel to it, it can not be above it nor below it.
They will remain horizontal lines. A line parallel to the x-axis will remain a line parallel to the x-axis no matter how far back into space they go.
An horizontal line . A line parallel with the x-axis. NB A vertical line / a slope parallel with the y-axis is described as 'undefined'.