Math Problem Statement

What is the image point of left parenthesis, minus, 9, comma, minus, 2, right parenthesis(−9,−2) after the transformation r, start subscript, x-axis, end subscript, circle, T, start subscript, minus, 1, comma, 3, end subscriptr x-axis ​ ∘T −1,3 ​ ?

Solution

Let's break down the transformation step by step:

1. Translation T(1,3)T_{(-1, 3)}:

The translation T(1,3)T_{(-1, 3)} means shifting the point by 1-1 unit along the xx-axis and +3+3 units along the yy-axis.

For the point (9,2)(-9, -2):

  • The new xx-coordinate will be 9+(1)=10-9 + (-1) = -10.
  • The new yy-coordinate will be 2+3=1-2 + 3 = 1.

So after the translation, the point becomes (10,1)(-10, 1).

2. Reflection across the xx-axis rxaxisr_{x-axis}:

To reflect a point across the xx-axis, the xx-coordinate remains the same, while the yy-coordinate changes its sign.

For the point (10,1)(-10, 1):

  • The xx-coordinate remains 10-10.
  • The yy-coordinate becomes 1-1.

Thus, after the reflection, the point is (10,1)(-10, -1).

Final Answer:

The image of the point (9,2)(-9, -2) after the transformation rxaxisT(1,3)r_{x-axis} \circ T_{(-1, 3)} is (10,1)(-10, -1).

Would you like further details or have any questions? Here are five related questions for further exploration:

  1. How would the transformation change if the reflection was across the yy-axis instead?
  2. What is the matrix representation of a reflection across the xx-axis?
  3. How do you calculate the inverse of a translation transformation?
  4. What happens if you apply the transformations in reverse order?
  5. How does the slope of a line connecting the original and final points change after these transformations?

Tip: When reflecting across the xx-axis, only the yy-coordinate changes, while the xx-coordinate remains unchanged.

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Math Problem Analysis

Mathematical Concepts

Transformations
Translation
Reflection

Formulas

Translation formula: (x, y) → (x + a, y + b)
Reflection across x-axis: (x, y) → (x, -y)

Theorems

Translation Theorem
Reflection Theorem

Suitable Grade Level

Grades 9-10