Find the value of a for which point p(a,2) is the mid point of line segment joining the points q(-5,4) and r(-1,0).
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p (a,2) = p {( x1+x2)÷2 , (y1+y2) ÷ 2}
=> p (a,2) = p ( -6/2, 4/2)
=> p (a,2) = p ( -3,2)
=> a = -3
=> p (a,2) = p ( -6/2, 4/2)
=> p (a,2) = p ( -3,2)
=> a = -3
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