Math Problem Statement

Find the point on the y-axis that is equidistant from (-5,-2) and (3, 2).

Solution

To find the point on the yy-axis that is equidistant from the points (5,2)(-5, -2) and (3,2)(3, 2), we can follow these steps:

  1. Identify the coordinates of the point on the yy-axis:
    Any point on the yy-axis has coordinates of the form (0,y)(0, y).

  2. Set up the distance formulas:
    The distance between two points (x1,y1)(x_1, y_1) and (x2,y2)(x_2, y_2) is given by:
    d=(x2x1)2+(y2y1)2d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}

    Let's compute the distances from the point (0,y)(0, y) to each of the two given points:

    • Distance to (5,2)(-5, -2): d1=(0(5))2+(y(2))2=(5)2+(y+2)2d_1 = \sqrt{(0 - (-5))^2 + (y - (-2))^2} = \sqrt{(5)^2 + (y + 2)^2}

    • Distance to (3,2)(3, 2): d2=(03)2+(y2)2=(3)2+(y2)2d_2 = \sqrt{(0 - 3)^2 + (y - 2)^2} = \sqrt{(-3)^2 + (y - 2)^2}

  3. Set the distances equal to each other (since the point (0,y)(0, y) is equidistant from both points): 52+(y+2)2=(3)2+(y2)2\sqrt{5^2 + (y + 2)^2} = \sqrt{(-3)^2 + (y - 2)^2}

  4. Square both sides to eliminate the square roots: 52+(y+2)2=(3)2+(y2)25^2 + (y + 2)^2 = (-3)^2 + (y - 2)^2

  5. Simplify the equation: 25+(y+2)2=9+(y2)225 + (y + 2)^2 = 9 + (y - 2)^2

  6. Expand the squares: 25+(y2+4y+4)=9+(y24y+4)25 + (y^2 + 4y + 4) = 9 + (y^2 - 4y + 4)

    25+y2+4y+4=9+y24y+425 + y^2 + 4y + 4 = 9 + y^2 - 4y + 4

  7. Combine like terms: 29+y2+4y=13+y24y29 + y^2 + 4y = 13 + y^2 - 4y

    29+4y=134y29 + 4y = 13 - 4y

  8. Solve for yy: 4y+4y=13294y + 4y = 13 - 29

    8y=168y = -16

    y=2y = -2

  9. Conclusion:
    The point on the yy-axis that is equidistant from (5,2)(-5, -2) and (3,2)(3, 2) is (0,2)(0, -2).

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Related Questions

  1. How do you find a point equidistant from three points in a plane?
  2. What is the formula for the distance between a point and a line?
  3. How do you find the perpendicular bisector of a line segment in coordinate geometry?
  4. What is the shortest distance from a point to a line?
  5. How do you calculate the midpoint of a line segment in a coordinate plane?

Tip

When solving geometric problems involving distances, sketching the situation on a graph can provide a visual aid and help clarify the relationships between points and lines.

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Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Distance Formula

Formulas

Distance formula

Theorems

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Suitable Grade Level

Grades 9-12