Math Problem Statement

What is the image of the point left parenthesis, minus, 3, comma, 5, right parenthesis(−3,5) after a rotation of 90, degrees90 ∘ counterclockwise about the origin?

Solution

To find the image of a point after a 9090^\circ counterclockwise rotation about the origin, we can use the following rule:

  • The image of (x,y)(x, y) after a 9090^\circ counterclockwise rotation becomes (y,x)(-y, x).

Given the point (3,5)(-3, 5), we apply this transformation:

(x,y)=(3,5)(y,x)=(5,3)(x, y) = (-3, 5) \quad \rightarrow \quad (-y, x) = (-5, -3)

So, the image of the point (3,5)(-3, 5) after a 9090^\circ counterclockwise rotation about the origin is (5,3)(-5, -3).

Would you like more details or have any questions? Here are some related questions:

  1. What is the formula for rotating a point 180180^\circ about the origin?
  2. How would you rotate a point 270270^\circ counterclockwise about the origin?
  3. What is the image of the point (4,2)(4, -2) after a 9090^\circ counterclockwise rotation?
  4. How do you reflect a point across the x-axis and y-axis?
  5. How would you describe a 9090^\circ clockwise rotation about the origin?

Tip: To remember rotations, it's helpful to visualize the coordinate plane and imagine moving counterclockwise or clockwise around the origin.

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Math Problem Analysis

Mathematical Concepts

Geometry
Coordinate Transformations

Formulas

Rotation formula: (x, y) -> (-y, x) for 90° counterclockwise rotation

Theorems

Rotation Theorem

Suitable Grade Level

Grades 9-10