Yes. If two planes are not coincident (the same plane) and are not parallel,
then they intersect in one straight line.
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The intersection of two planes is one straight line.
Yes. In fact, if they are not the same plane, then they must intersect in a unique straight line.
Yes, the intersection of 2 planes is a 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.