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Mathematics

The point P(2, -7) is reflected in the point (0, 3); the co-ordinates of the image of point P are :

  1. (2, 13)

  2. (2, -13)

  3. (-2, -13)

  4. (-2, 13)

Section Formula

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Answer

Let point P on reflection in the point (0, 3) becomes P'(x, y).

So, (0, 3) will be the mid-point of PP'.

By formula,

Mid-point = (x1+x22,y1+y22)\Big(\dfrac{x1 + x2}{2}, \dfrac{y1 + y2}{2}\Big)

Substituting values we get :

(0,3)=(2+x2,7+y2)0=2+x2 and 3=7+y22+x=0 and 7+y=6x=2 and y=6+7x=2 and y=13.\Rightarrow (0, 3) = \Big(\dfrac{2 + x}{2}, \dfrac{-7 + y}{2}\Big) \\[1em] \Rightarrow 0 = \dfrac{2 + x}{2} \text{ and } 3 = \dfrac{-7 + y}{2} \\[1em] \Rightarrow 2 + x = 0 \text{ and } -7 + y = 6 \\[1em] \Rightarrow x = -2 \text{ and } y = 6 + 7 \\[1em] \Rightarrow x = -2 \text{ and } y = 13.

P' = (-2, 13).

Hence, Option 4 is the correct option.

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