Math Problem Statement

A third object must be placed on segment AB, at a point C located 3/5 of the way along segment AB, starting from point A. Identify the coordinates of point C.

Solution

We are given two points on a Cartesian plane:

  • Point A(4,2)A(4, 2)
  • Point B(22,12)B(22, 12)

We need to find the coordinates of point CC, which is located 35\frac{3}{5} of the way along segment ABAB, starting from point AA.

The formula to find a point that divides a line segment in a given ratio is:

C(x,y)=(x1+mm+n×(x2x1), y1+mm+n×(y2y1))C(x, y) = \left( x_1 + \frac{m}{m+n} \times (x_2 - x_1),\ y_1 + \frac{m}{m+n} \times (y_2 - y_1) \right)

Here:

  • A(x1,y1)=(4,2)A(x_1, y_1) = (4, 2)
  • B(x2,y2)=(22,12)B(x_2, y_2) = (22, 12)
  • mm+n=35\frac{m}{m+n} = \frac{3}{5}

Now applying the formula for both the xx-coordinate and yy-coordinate of point CC:

  1. For the xx-coordinate: xC=4+35×(224)=4+35×18=4+545=205+545=745x_C = 4 + \frac{3}{5} \times (22 - 4) = 4 + \frac{3}{5} \times 18 = 4 + \frac{54}{5} = \frac{20}{5} + \frac{54}{5} = \frac{74}{5}

  2. For the yy-coordinate: yC=2+35×(122)=2+35×10=2+6=8y_C = 2 + \frac{3}{5} \times (12 - 2) = 2 + \frac{3}{5} \times 10 = 2 + 6 = 8

Thus, the coordinates of point CC are (745,8)\left( \frac{74}{5}, 8 \right).

This matches option A in the provided choices.


Would you like more details or explanations on this solution?

Here are 5 related questions to explore:

  1. How do you derive the section formula?
  2. What are some real-world applications of dividing a line segment in a given ratio?
  3. How would the formula change if point CC were located outside segment ABAB?
  4. Can you derive the midpoint formula from this general ratio division formula?
  5. How do changes in the ratio mm+n\frac{m}{m+n} affect the location of point CC?

Tip: Always verify your solution by plugging values back into the problem, especially when working with fractions!

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Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Section Formula
Ratio Division

Formulas

C(x, y) = (x1 + (m / (m+n)) * (x2 - x1), y1 + (m / (m+n)) * (y2 - y1))

Theorems

Section Formula

Suitable Grade Level

Grades 9-12