No from D to F the line is slanted which throws off both triangles but that does not make the the same
n points would divide a given line into n+1 segments.
Just assume that you have a line and you added a point to that line, this point would divide your line into two segments.
If you add two points to a line, these two points would divide your line into three segments.
So the number of segments is always greater that the number of points by 1.
The y-intercept of a line is where the line goes across the y line.
Does that answer your question?
A (0,3) B(1,-5) C(4,-1) D(0,-6)