There are 9 line segments.
THe maximum number of lines that can be achieved between 9 points is 8+7+6+5+4+3+2+1=36.
Each point can be connected to every other point. That gives you 10 x 9. However, since this counts each line segment twice, this result should be divided by 2.
Eight, which will be sufficient for 14 squares.
-- The beginning point of a line can be any one of the 10 points. For each of these ...-- The end point of the line can be any one of the remaining 9 points.So there are (10 x 9) = 90 ways to form a line with 2 of 10 non-colinear points.But once a line is drawn, there's no difference between it and the one that was drawn in the opposite direction between the same two points. So the 90 ways of forming lines actually produce (90 / 2) = 45 unique line segments.
-4
11 and -7
No, because the second line is not defined.
No, they could only form a straight line.
If you mean points of: (4, 5) (6, 7) and (8, 9) then it is a straight line of y = x+1
If the line passing through these points is a straight line then it has a positive gradient.
Points: (3, 15) and (5, 9) Slope: -3