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Two planes intersect at a line. The line where they intersect pertains to both planes. In the same manner, if infinitely many planes intersect each other at the same line, then that line pertains to the infinitely many planes.
If two line segments are congruent then they have the same length.
Collinear lines are on the same line.
If it is a straight line it must be in the same plane. Otherwise not necessarily.
No, they cannot - unless the two lines are effectively the same line.