Question 740984
Point "A" (-4,1) is in the standard (x,y) coordinate plane.
 What must be the coordinates of point "B" so that the line x = 2 is the perpendicular bisector of "AB", with a line drawn above "AB"?
;
Since the bisector is a vertical line, line AB is a horizontal line.
:
The best way to understand this is use graph paper. Draw the x/y, point -4,1; 
the line for x=2 is a vertical line going thru x=2, will cross Line AB at x/y point 2,1
As you can see, Line AB will between points -4,1 and 8,1