3. Ir (a/3, 4) is the mid-point of the segment joining the points PC-6,5) and R(-2.3).
then the value of a' is
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mid point= (x1+X2/2),(y1+y2/2)
P(-6,5)=(x1,y1)
R(-2,3)=(X2,y2)
mid point is given as (a/3,4)
substitute this values in the given formula
then,we get
(a/3,4)=(-6+(-2)/2),(5+3/2)
a/3=-4/2==-2
4=8/2=4
Therefore,a/3=-2
-2a=3
a=-3/2
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