Q. 124.4( 5 Votes )

If the middle point of the line segment joining (3,4) and (k,7) is (x,y) and 2x+2y+1=0, find the value of k.

Let P be the midpoint of the line segment joining (3, 4) and (k, 7)

So, the coordinates of P are:

Again,

2x + 2y + 1 = 0

3 + k + 11 + 1 = 0

k + 15 = 0

k = -15

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