What is the value of k if the mid-point of the line joining (1 - k, - 4) and (2, k + 1) is (-k , k)?
A
-3
B
-1
C
-4
D
-2
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
(1-k+2) / 2 = - k and -4 + k + 1 = k
3-k = -2k and -3 + k = 2k
K = -3 and k = -3
Source: Myschool Past Questions Archive (Record #9253)