Haryana Police Constable Model Paper 3

P is mid-point segment AB
∴ Co-ordinates of P is the average of co-ordinates of A and B
Let co-ordinates of B be (x, y)
⇒(−1,1)= $\left(\frac{4+\mathrm{x}}{2},\frac{3+\mathrm{y}}{2}\right)$
⇒ -1 = $\frac{\left(4+\mathrm{x}\right)}{2}$
⇒ -2 = 4 + x
⇒ x = -6
Also, 2 = 3 + y
⇒ y = -1
∴ Co-ordinates of B are (-6, -1)