If the midpoint of the line joining (1 - k, -4) and (2, k...
If the midpoint of the line joining (1 - k, -4) and (2, k + 1) is (-k, k), find the value of k.
-4
-3
-2
-1
Correct answer is D
Midpoint between (x1,y1) and (x2,y2) = (x1+x22,y1+y22).
(−k,k)=(2+(1+k)2,−4+(k+1)2)
−k=k+32⟹−2k=k+3
−3k=3⟹k=−1
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