"Collinear" means "on the same straight line".Two points are always collinear, because you can always draw a straight linebetween any two points. Three points may or may not be collinear.
Three
If only 7 are colinear, then the question implies the lines need not go through every point. In that case there is an infinity of lines for each point.
Collinear lines lie on the same straight line passing through the same points and they are coplanular lines when meeting on the same plane.
7.
"Collinear" means "on the same straight line".Two points are always collinear, because you can always draw a straight linebetween any two points. Three points may or may not be collinear.
The definition of a non-collinear line is that this is a line on which points do not lie on one line. The opposite of this is a collinear point. Collinear points refer to three points that do fall on a straight line.
Three
3 lines and one plane
Yes. You can draw infinitely many straight lines from each point.
If only 7 are colinear, then the question implies the lines need not go through every point. In that case there is an infinity of lines for each point.
Collinear lines lie on the same straight line
Not sure about complanar. Coplanar lines can be collinear but need not be.
Collinear lines lie on the same straight line passing through the same points and they are coplanular lines when meeting on the same plane.
As defined by Math Open Reference: collinear points are points that lie on the same line. Any series of points with a yvalue of 4, for example, will be collinear since they lie on the same line. Lines formed by collinear points can have any slope and be located anywhere on a co-ordinate plane. The Math Open Reference link shows a working visual example of collinear points.
7.
No. Collinear means on the same line. So collinear points all must lie on the same line. Not parallel lines.