1. ## 3d coordinate geometry

when i plotted x+y=z in xyz plane i got a straight line.what do i infer from this

2. Originally Posted by prasum
when i plotted x+y=z in xyz plane i got a straight line.what do i infer from this
Sorry, but the text of your question doesn't make sense ...

The given equation describes a plane which passes through the origin and it's normal vector is $\vec n = (1,1,-1)$.

And the intersection of this plane with one of the coordinate planes (xy, xz or yz) is a straight line. Therefore the given plane isn't parallel to any of the three coordinate planes.

But as I mentioned above there isn't a xyz plane.