Yes, the intersection of 2 planes is a line.
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Yes. If two planes are not coincident (the same plane) and are not parallel, then they intersect in one straight line.
A line .
No. Two planes may be parallel and so may not intersect. Also, any line is the intersection of infinitely many planes, not just two.
Two planes intersect (not interscept) at an edge (or a line).
No, planes intersect at a line.