Math Problem Statement

the midpoint of line AB is M(4-4). If the coordinates of A are (-3,1) what are the coordinates of B?

Solution

To find the coordinates of point BB, we use the midpoint formula. The midpoint M(x,y)M(x, y) of a line segment between two points A(x1,y1)A(x_1, y_1) and B(x2,y2)B(x_2, y_2) is given by:

M=(x1+x22,y1+y22)M = \left( \frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2} \right)

In this problem:

  • Midpoint M=(4,4)M = (4, -4)
  • Point A=(3,1)A = (-3, 1)
  • Point B=(x2,y2)B = (x_2, y_2)

We need to find the coordinates of B(x2,y2)B(x_2, y_2).

Step-by-Step Solution:

  1. Calculate the x-coordinate of B:

    4=3+x224 = \frac{-3 + x_2}{2}

    Multiply both sides by 2:

    8=3+x28 = -3 + x_2

    Add 3 to both sides:

    x2=11x_2 = 11

  2. Calculate the y-coordinate of B:

    4=1+y22-4 = \frac{1 + y_2}{2}

    Multiply both sides by 2:

    8=1+y2-8 = 1 + y_2

    Subtract 1 from both sides:

    y2=9y_2 = -9

Conclusion:

The coordinates of point BB are (11,9)(11, -9).

Would you like more details, or do you have any questions?

Here are 5 related questions for further exploration:

  1. How do you find the midpoint if both points are given?
  2. How can you determine the distance between two points?
  3. How do you find the equation of a line given two points?
  4. What is the significance of the slope of a line segment?
  5. How can the midpoint formula be used in geometry problems?

Tip: Always double-check your calculations by substituting the values back into the formula to verify your results.

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Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Midpoint Formula

Formulas

Midpoint formula

Theorems

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Suitable Grade Level

Grades 7-9