If the line is straight, then only one line may connect two points.
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there are 6 lines can pass through 4 noncollinear points.
There is only one possible line that can can through two different points, presuming there are no overlaps.
There can be infinitely many lines: think of the longitudes through he North and South poles. However, there can be only one straight line.
An infinite number of lines can pass through a point.
Colinear points mean that if you draw a (really long) line between any two of them, the line will pass through the others. Or simply: there can exist a straight line that can pass through all of them. These are colinear points: . .... .. One line can pass through all of them: These ar not colinear points: :. If I try to connect any two of them with a line, the third point will not lie on that line.