Math Problem Statement

What is the image of the point left parenthesis, 8, comma, 7, right parenthesis(8,7) after a rotation of 90, degrees90 ∘ counterclockwise about the origin?

Solution

To find the image of the point (8,7)(8, 7) after a 90° counterclockwise rotation about the origin, we use the following rule for rotations:

If a point (x,y)(x, y) is rotated 90° counterclockwise about the origin, its new coordinates become:

(x,y)=(y,x)(x', y') = (-y, x)

Step-by-Step Solution:

  1. The original point is (8,7)(8, 7), so x=8x = 8 and y=7y = 7.
  2. Applying the formula for 90° counterclockwise rotation: (x,y)=(7,8)(x', y') = (-7, 8)

Final Answer:

The image of the point (8,7)(8, 7) after a 90° counterclockwise rotation about the origin is (7,8)(-7, 8).

Would you like a detailed explanation or any clarifications on this process? Here are some related questions you might find helpful:

  1. What is the image of (8,7)(8, 7) after a 180° rotation?
  2. How do you perform a 270° counterclockwise rotation about the origin?
  3. What is the general formula for rotating any point by 90° clockwise?
  4. How would the coordinates change if the point was reflected across the y-axis instead of rotated?
  5. Can you explain how to rotate a point by 45° counterclockwise?

Tip: Always remember that a 90° counterclockwise rotation switches the coordinates and changes the sign of the original yy-coordinate.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Rotations
Transformations

Formulas

(x', y') = (-y, x) for 90° counterclockwise rotation

Theorems

Rotation theorem about the origin

Suitable Grade Level

Grades 8-10