Q. 33.6( 8 Votes )

# Prove that the origin O divides the line segment joining the points, A(1, –3) and B(–3, 9) in the ratio 1 : 3 internally. Find the coordinates of the points dividing externally.

Answer :

Internal divison formula:

Coordinates of a point P(x,y) dividing the line segment joining A (x_{1}, y_{1}) and B (x_{2}, y_{2}) in the ratio m:n internally are

Let O divide the line segment joining the given points in the ratio λ:1. Then by internal division formula,

3λ = 1

Hence proved that, the origin O divides the line segment joining the points, A(1, –3) and B(–3, 9) in the ratio 1 : 3 internally.

External divison formula:

Coordinates of a point P(x,y) dividing the line segment joining A (x_{1}, y_{1}) and B (x_{2}, y_{2}) in the ratio m:n externally are

Using external division formula,

x =

y =

P (3,–9) is the required point.

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