To solve this, subtract 6 from both sides of the greater than sign to get..
x is greater than -4
Number 1 = -6, -1, 3, 7, 11
Number 2 = -4, -3, -2, 1, 2
Number 3 = 3, 2, 1, 0, -1
Number 4 = -1, 2, 5, 8, 11
Formula to find the slope:
m = y2-y1 / x2-x1
(4,3); (8,5)
m= 5-3 / 8-4
m = 2/4
m = 1/2
Therefore, the slope of the line that passes through these points is 1/2
If by this you mean perpendicular bisectors, then they would intersect at one point.