No.
Two planes may be parallel and so may not intersect.
Also, any line is the intersection of infinitely many planes, not just two.
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The intersection of two planes is one straight line.
In 3d space, two planes will always intersect at a line...unless of course they are the same plane (they coincide). Because planes are infinite in both directions, there is no end point (as in a ray or segment). So, your answer is neither, planes intersect at a line.
Yes. If two planes are not coincident (the same plane) and are not parallel, then they intersect in one straight line.
Yes, the intersection of 2 planes is a line.
A line .