Family Lines System ended in 1983.
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They do not. A set of lines can also be considered as a system of linear equations. But the fact that there is such a system does not mean that the lines intersect.
Home Lines ended in 1988.
Seatrain Lines ended in 1981.
If the lines intersect, then the intersection point is the solution of the system. If the lines coincide, then there are infinite number of the solutions for the system. If the lines are parallel, there is no solution for the system.
Standard Air Lines ended in 1930.