The intersection of three planes is either a point, a line, or there is no intersection if any two of the planes are parallel to each other.
This tells us about possible solutions to 3 equations in 3 unknowns. There may be one solution, no solution, or infinite number of solutions.
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Nothing HAPPENS! They can intersect in a point or a line.
yes
No, they intersect at a line.
No, planes intersect at a line.
no