When the line is inclined to the plane. That is, it is not in the plane nor is it parallel to it.
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yes
yes
There are two possible answers; if the line is crossing the plane at an angle, then the line and the plane only intersect at one point. However, if the line is part of the plane, then the entire line intersects with the plane, and there are an infinite number of intersecting points.
The intersection of two planes is a line. (or a massive explosion...lol)
point of intersection.