Math Problem Statement

What is the image of the point left parenthesis, minus, 2, comma, minus, 7, right parenthesis(−2,−7) after a rotation of 90, degrees90 ∘ counterclockwise about the origin?

Solution

To determine the image of the point (2,7)(-2, -7) after a 90-degree counterclockwise rotation about the origin, we can apply the following transformation rule:

(x,y)(y,x)(x, y) \rightarrow (-y, x)

Here’s the process:

  1. The original point is (2,7)(-2, -7).
  2. After applying the rule:
    • x=2x = -2, y=7y = -7
    • New coordinates: ((7),2)(-(-7), -2) = (7,2)(7, -2)

Thus, the image of the point (2,7)(-2, -7) after a 90-degree counterclockwise rotation about the origin is (7, -2).

Would you like more details or have any questions?

Here are 5 related questions:

  1. What would be the image of (3,5)(3, 5) after a 90-degree counterclockwise rotation?
  2. How do you rotate a point 180 degrees about the origin?
  3. What is the rule for a 90-degree clockwise rotation about the origin?
  4. How do you find the new coordinates of a point after a 270-degree counterclockwise rotation?
  5. What happens when you reflect a point across the x-axis?

Tip: For a 90-degree counterclockwise rotation, you simply switch the coordinates and change the sign of the original y-coordinate.

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Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Rotations in the Cartesian Plane

Formulas

(x, y) → (-y, x) for 90-degree counterclockwise rotation

Theorems

Rotation transformation rule for 90 degrees counterclockwise

Suitable Grade Level

Grades 9-10