A point C with z-coordinate 8 lies on the line segment joining the points A(2, -3, 4) and B(8, 0, 10). Find the coordinates.

Asked by Sakshi | 1 year ago |  36

1 Answer

Solution :-

Given:

The points A (2, -3, 4) and B (8, 0, 10)

Let Point C(x, y, 8), and C divides AB in ratio k: 1

So, m = k and n = 1

A(2, -3, 4) and B(8, 0, 10)

Coordinates of C are:

RD Sharma Solutions for Class 11 Maths Chapter 28 – image 48

On comparing we get,

\(\dfrac{ [10k + 4] }{ [k + 1]}\) = 8

10k + 4 = 8(k + 1)

10k + 4 = 8k + 8

10k – 8k = 8 – 4

2k = 4

k = \( \dfrac{4}{2}\)

= 2

Here C divides AB in ratio 2:1

x =\(\dfrac{ [8k + 2] }{ [k + 1]}\)

=\( \dfrac{ [8(2) + 2] }{ [2 + 1]}\)

=\( \dfrac{[16 + 2] }{ [3]}\)

\( \dfrac{18}{3}\)

= 6

y = \( \dfrac{-3 }{ [k + 1]}\)

=\( \dfrac{-3 }{ [2 + 1]}\)

\( \dfrac{-3}{3}\)

= -1

The Coordinates of C are (6, -1, 8).

Answered by Aaryan | 1 year ago

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