Math Problem Statement

What is the image of the point left parenthesis, minus, 7, comma, 4, right parenthesis(−7,4) after a rotation of 90, degrees90∘ counterclockwise about the origin?

Solution

To find the image of the point (7,4)(-7, 4) after a 9090^\circ counterclockwise rotation about the origin, we use the rotation transformation rule for 9090^\circ counterclockwise:

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

For the point (7,4)(-7, 4):

  • x=7x = -7
  • y=4y = 4

Applying the transformation: (7,4)(4,7)(-7, 4) \rightarrow (-4, -7)

The image of the point (7,4)(-7, 4) after a 9090^\circ counterclockwise rotation about the origin is:

(4,7)(-4, -7)

Would you like further details or a graphical explanation?


Related Questions:

  1. What is the result of a 180180^\circ rotation for the same point?
  2. How would a 9090^\circ clockwise rotation change the coordinates?
  3. Can you generalize the rule for a 270270^\circ counterclockwise rotation?
  4. What would the coordinates be if reflected across the x-axis instead of rotated?
  5. How does the transformation change if the center of rotation is not the origin?

Tip:

Always visualize rotations with reference to quadrants to avoid errors.

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Math Problem Analysis

Mathematical Concepts

Geometry
Rotations
Coordinate Transformations

Formulas

(x, y) → (-y, x) for 90° counterclockwise rotation about the origin

Theorems

Rotation Transformation Rules

Suitable Grade Level

Grades 8-10