Q(m, n) and R(n, -4)
Midpoint : P(2, m)
implies(m+n2,n−42)=(2,m)
m+n=2×2impliesm+n=4...(i)
n−4=2×mimpliesn−4=2m...(ii)
Solving (i) and (ii) simultaneously,
m = 0 and n = 4.
