If (a,2a) is the mid-point of line segment joining the points (−5,7) and (3,−11), then the point (a−2,a+5) will lie in
If R (5, 6) is the mid-point of the line segment AB joining the points A (6, 5) and B (4, y), then y equals
(a) 5 (b) 7 (c) 12 (d) 6