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Mathematics

The point which divides the line segment joining the points A(3, -2) and B(6, 7) internally in the ratio 3 : 2 lies in which of the following quadrants?

  1. I

  2. II

  3. III

  4. IV

Section Formula

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Answer

Let point P be (x, y).

The point which divides the line segment joining the points A(3, -2) and B(6, 7) internally in the ratio 3 : 2 lies in which of the following quadrants? Reflection, RSA Mathematics Solutions ICSE Class 10.

Given,

m1 : m2 = 3 : 2

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)=(3×6+2×33+2,3×7+2×(2)3+2)=(18+65,2145)=(245,175).\Rightarrow (x, y) = \Big(\dfrac{3 \times 6 + 2 \times 3}{3 + 2}, \dfrac{3 \times 7 + 2 \times (-2)}{3 + 2}\Big) \\[1em] = \Big(\dfrac{18 + 6}{5}, \dfrac{21 - 4}{5}\Big) \\[1em] = \Big(\dfrac{24}{5}, \dfrac{17}{5}\Big).

Here, both x and y are positive.

Therefore, the point lies in the 1st Quadrant.

Hence, Option 1 is the correct option.

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