Three Dimensional Geometry Part 1

The directions ratios of the line segment joining points
A(1,0,7) and B(1,6,3) are 0,6,−4.
The direction ratios of the given line are 1,2,3.
Clearly 1×0+2×6+3×(−4)=0
So, the given line is perpendicular to line AB.
Also, the mid point of A and B is (1,3,5) which lies on the given line.
So, the image of B in the given line is A, because the given line is the perpendicular bisector of line segment joining points A and B, But statement −2 is not a correct explanation for statement −1.