It simply means where the horizon (where earth meets sky) sits in the frame. It is generally boring to keep it in the center. It stops the eyes. Try framing so there is a lot of sky, a little sky with the camera level.
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It is the horizon line.
If the line is not IN the plane ... it just zaps through the plane from some direction ... then it touches the plane in only one point. The intersection is a point.if it is lined up with the plane, then the intersection is a line.
It's a line segment that's parallel to the horizon.
If you mean y = -4x-6 then it is a straight line equation that can be graphed on the Cartesian plane
Yes, a plane containing 2 points of a line contains the entire line. Let us consider two points on a plane and then draw a line segment joining those two points. Since the points lie on the plane so line segment has to lie completely on that plane too. Now if we extend the line segment indefinitely in both directions we get a line and that line also has to lie on the same plane since some definite part(line segment) of it(line) also lies on the same plane.