Math Problem Statement

What is the image point of left parenthesis, 6, comma, 6, right parenthesis(6,6) after the transformation r, start subscript, y, equals, minus, x, end subscript, circle, D, start subscript, one third, end subscriptr y=−x ​ ∘D 3 1 ​

​ ?

Solution

Let's break down the transformation step by step.

You are dealing with two transformations:

  1. Dilation by a factor of 13\frac{1}{3}
    • Denoted as D13D_{\frac{1}{3}}, this transformation shrinks the point by a factor of 13\frac{1}{3}.
  2. Reflection over the line y=xy = -x
    • Denoted as ry=xr_{y = -x}, this reflects a point across the line y=xy = -x.

Step 1: Apply the dilation D13D_{\frac{1}{3}}

The dilation D13D_{\frac{1}{3}} scales both coordinates by 13\frac{1}{3}.

Given point (6,6)(6, 6), apply the dilation: D13(6,6)=(136,136)=(2,2)D_{\frac{1}{3}}(6, 6) = \left( \frac{1}{3} \cdot 6, \frac{1}{3} \cdot 6 \right) = (2, 2)

Step 2: Apply the reflection ry=xr_{y = -x}

After dilation, we reflect the point (2,2)(2, 2) across the line y=xy = -x. The reflection rule across y=xy = -x swaps and negates the coordinates: ry=x(2,2)=(2,2)r_{y = -x}(2, 2) = (-2, -2)

Final Answer:

The image point of (6,6)(6, 6) after the transformation ry=xD13r_{y = -x} \circ D_{\frac{1}{3}} is (2,2)(-2, -2).

Would you like further details or have any questions?

Here are 5 related questions for deeper understanding:

  1. How do you apply a dilation transformation with a different factor?
  2. What is the general formula for reflecting points over a line?
  3. How do composite transformations work geometrically?
  4. What would happen if the dilation factor was negative?
  5. How would you describe the composition of two reflections?

Tip: In a reflection over y=xy = -x, the coordinates of any point swap and change signs!

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Math Problem Analysis

Mathematical Concepts

Geometry
Transformations
Dilation
Reflection

Formulas

Dilation by a factor k: D_k(x, y) = (k * x, k * y)
Reflection over y = -x: r_{y=-x}(x, y) = (-y, -x)

Theorems

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Suitable Grade Level

Grades 9-10