Math Problem Statement

What is the point that divides the directed line segment from point A to point B in a 1:4 ratio?

Solution

To find the point that divides the line segment from point A to point B in a 1:4 ratio, we will use the section formula. The coordinates of A and B are as follows:

  • A=(4,4)A = (-4, -4)
  • B=(6,6)B = (6, 6)

Section Formula:

If a point divides the line segment joining two points A(x1,y1)A(x_1, y_1) and B(x2,y2)B(x_2, y_2) in the ratio m:nm:n, the coordinates of the point are given by:

P=(mx2+nx1m+n,my2+ny1m+n)P = \left( \frac{m x_2 + n x_1}{m+n}, \frac{m y_2 + n y_1}{m+n} \right)

In this case:

  • m=1m = 1
  • n=4n = 4
  • x1=4x_1 = -4, y1=4y_1 = -4 (coordinates of A)
  • x2=6x_2 = 6, y2=6y_2 = 6 (coordinates of B)

Now, applying the formula:

Px=16+4(4)1+4=6165=105=2P_x = \frac{1 \cdot 6 + 4 \cdot (-4)}{1+4} = \frac{6 - 16}{5} = \frac{-10}{5} = -2

Py=16+4(4)1+4=6165=105=2P_y = \frac{1 \cdot 6 + 4 \cdot (-4)}{1+4} = \frac{6 - 16}{5} = \frac{-10}{5} = -2

Thus, the point that divides the line segment in the 1:4 ratio is (2,2)(-2, -2).

Would you like more details or have any questions?

Related Questions:

  1. How would the coordinates change if the ratio was 2:3 instead of 1:4?
  2. What is the distance between points A and B?
  3. Can you find the midpoint of the line segment AB?
  4. How would you generalize the section formula for a 3D coordinate system?
  5. What would be the coordinates if the ratio was reversed (4:1)?

Tip:

Always ensure you assign the correct values for the ratio and the coordinates of the points when applying the section formula!

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Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Ratios
Section Formula

Formulas

P = ( (mx2 + nx1) / (m + n), (my2 + ny1) / (m + n) )

Theorems

Section Formula

Suitable Grade Level

Grades 9-12