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Mathematics

The points A, B and C divide the line segment joining the points P(-3, 8) and Q(9, -4) into four equal parts. If A is nearest to P, then the coordinates of A are:

  1. (-3, 5)

  2. (0, 5)

  3. (3, 5)

  4. (6, -1)

Section Formula

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Answer

Given,

The points dividing PQ into four equal parts be A, B and C such that A is nearest to P.

Since the line segment PQ is divided into four equal parts, the point A divides PQ in the ratio 1 : 3.

The points A, B and C divide the line segment joining the points P(-3, 8) and Q(9, -4) into four equal parts. If A is nearest to P, then the coordinates of A are: Reflection, RSA Mathematics Solutions ICSE Class 10.

By section-formula,

(x, y) = (m1x2+m2x1m1+m2,m1y2+m2y1m1+m2)\Big(\dfrac{m1x2 + m2x1}{m1 + m2}, \dfrac{m1y2 + m2y1}{m1 + m2}\Big)

Substituting values we get :

(x,y)=(1×9+3×(3)1+3,1×(4)+3×81+3)(994,4+244)(04,204)(0,5).\Rightarrow (x, y) = \Big(\dfrac{1 \times 9 + 3 \times (-3)}{1 + 3}, \dfrac{1 \times (-4) + 3 \times 8}{1 + 3}\Big) \\[1em] \Rightarrow \Big(\dfrac{9 - 9}{4}, \dfrac{-4 + 24}{4}\Big) \\[1em] \Rightarrow \Big(\dfrac{0}{4}, \dfrac{20}{4}\Big) \\[1em] \Rightarrow (0, 5).

Hence, Option 2 is the correct option.

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