If P(1/2 ,4) is the mid-point of the line segment joining the points Q(- 6, 5) and fl(- 2, 3), then the value of a is
(a)-4 (b) -12 (c) 12 (d) -6
Solution:
(b) Given that, P( ,4) is the mid-point of the line segment joining the points Q(-6, 5) and R (-2, 3), which shows in the figure given below
Hence, the required value of a is -12.
