Math Problem Statement

Plies on a line segment AB and AP = 3 7 AB.

A is at (-2,-2) and B is at (2, -4).

Find the coordinates of P.

P =

Solution

Given:

  • Coordinates of AA: (2,2)(-2, -2)
  • Coordinates of BB: (2,4)(2, -4)
  • Point PP divides ABAB such that AP=37ABAP = \frac{3}{7} AB

This means the ratio in which PP divides ABAB is 3:43 : 4 (since AP=37ABAP = \frac{3}{7} AB, PB=47ABPB = \frac{4}{7} AB).

Using the section formula, if a point P(x,y)P(x, y) divides a line segment joining 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 PP are given by: x=mx2+nx1m+nx = \frac{mx_2 + nx_1}{m+n} y=my2+ny1m+ny = \frac{my_2 + ny_1}{m+n}

Here:

  • x1=2x_1 = -2, y1=2y_1 = -2
  • x2=2x_2 = 2, y2=4y_2 = -4
  • m=3m = 3, n=4n = 4

Calculating the coordinates of PP: x=32+4(2)3+4=687=27x = \frac{3 \cdot 2 + 4 \cdot (-2)}{3 + 4} = \frac{6 - 8}{7} = \frac{-2}{7} y=3(4)+4(2)3+4=1287=207y = \frac{3 \cdot (-4) + 4 \cdot (-2)}{3 + 4} = \frac{-12 - 8}{7} = \frac{-20}{7}

So, the coordinates of PP are: P(27,207)P \left( \frac{-2}{7}, \frac{-20}{7} \right)

Would you like more details or have any questions?

Here are 5 questions for you to ask:

  1. Can you explain the section formula in more detail?
  2. How do you convert a ratio like AP:PBAP : PB to m:nm : n?
  3. Can you show another example of a point dividing a line segment in a given ratio?
  4. What happens if the point PP divides ABAB externally?
  5. Can you explain the midpoint formula as well?

Tip: When working with ratios, ensure you clearly distinguish between the different parts of the segment being compared to avoid mistakes.

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Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Section Formula
Ratio Division of Line Segments

Formulas

Section formula for division of a line segment

Theorems

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Suitable Grade Level

Grades 9-12