There are 91 lines.
Only one line can be drawn through eight points.
1
If you're talking about straight lines (not curves) the answer is one.
In Geometry
One.
There are 91 lines.
Only one line can be drawn through eight points.
1
15 lines.
Infinity
3 lines and one plane
In Euclidian or plane geometry, there can be only one line through two fixed points. Lines cannot actually be drawn; if you see it it is not a geometric line. If the points are on a curved surface as in a geometry that is non-Euclidian, then there can be infinitely many lines connecting two points.
1 straight line. An infinite number of curved lines.
If you're talking about straight lines (not curves) the answer is one.
In Geometry
A line consists of infinitely many points which all satisfy some condition. In that respect, one point or even a trillion points do not make a line. There are infinitely many lines that can be drawn through one point.