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A minimum of 2, but an infinite number of planes can intersect at the same line.
Yes, the intersection of 2 planes is a line.
If the 2 lines lie in the same plane, and they are not parallel, then they will intersect at some point. If the 2 lines are skew lines, then they are not in the same plane, and they will not intersect (but they are Not Parallel)
They have a starting point, end point, definite length, they connect 2 points, they have a definite slope, they do not always have a y- intersect or x- intersect.
You cannot. The intersection of 2 planes must be a straight line or the whole plane; it cannot be just a point.